diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000000000000000000000000000000000000..4700f8945b9a985020feca3c3f335c3d3cb26c74
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,12 @@
+Copyright (C) 2024, Mitja Felicijan <mitja.felicijan@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
Binary files /dev/null and b/README.md differ
diff --git a/c-asm/.clang-format b/c-asm/.clang-format
new file mode 100644
index 0000000000000000000000000000000000000000..5f0e5858e8486f9ed0471951032c497a07a45ef1
--- /dev/null
+++ b/c-asm/.clang-format
@@ -0,0 +1,4 @@
+BasedOnStyle: Chromium
+ColumnLimit: 120
+IndentWidth: 4
+
diff --git a/c-asm/Makefile b/c-asm/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..907e50c3352a7c59c5202fab494bf4e74743e0f6
--- /dev/null
+++ b/c-asm/Makefile
@@ -0,0 +1,13 @@
+all: a.out
+
+sum.o:
+	as sum.s -o sum.o
+
+a.out: sum.o
+	gcc main.c sum.o
+
+clean:
+	-rm a.out *.o
+
+tags:
+	ctags -R *
diff --git a/c-asm/main.c b/c-asm/main.c
new file mode 100644
index 0000000000000000000000000000000000000000..56b9bc5cbf578107f348194e66fd1b69fcd13ab8
--- /dev/null
+++ b/c-asm/main.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int sum(int a, int b);
+
+int main() {
+    for (int i = 0; i < 10; ++i) {
+        printf("SUM of 5+%d is %d\n", i, sum(5, i));
+    }
+
+    return 0;
+}
diff --git a/c-asm/sum.s b/c-asm/sum.s
new file mode 100644
index 0000000000000000000000000000000000000000..8b943b999927cdde6e1adddd76b1b9b7e2ea03f9
--- /dev/null
+++ b/c-asm/sum.s
@@ -0,0 +1,11 @@
+.intel_syntax noprefix
+
+.global sum
+
+.text
+
+sum:
+	add rdi, rsi
+	mov rax, rdi
+	ret
+
diff --git a/c-embed/.clang-format b/c-embed/.clang-format
new file mode 100644
index 0000000000000000000000000000000000000000..5f0e5858e8486f9ed0471951032c497a07a45ef1
--- /dev/null
+++ b/c-embed/.clang-format
@@ -0,0 +1,4 @@
+BasedOnStyle: Chromium
+ColumnLimit: 120
+IndentWidth: 4
+
diff --git a/c-embed/Makefile b/c-embed/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..29e4f2d0159a0512b6650b7d48ad9c87bb057737
--- /dev/null
+++ b/c-embed/Makefile
@@ -0,0 +1,6 @@
+a.out:
+	xxd -i test.txt > test.h
+	gcc -Wall -Werror -Wpedantic main.c
+
+clean:
+	-rm a.out
diff --git a/c-embed/main.c b/c-embed/main.c
new file mode 100644
index 0000000000000000000000000000000000000000..c0d2f591e05177dc7700091be770944678ec10eb
--- /dev/null
+++ b/c-embed/main.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+#include "test.h"
+
+int main(void) {
+    printf("Testing embedding of files into binary.\n");
+
+    for (unsigned int i = 0; i < test_txt_len; i++) {
+        printf("%02x ", test_txt[i]);
+    }
+    printf("\n\n");
+
+    for (unsigned int i = 0; i < test_txt_len; i++) {
+        printf("%c", test_txt[i]);
+    }
+    printf("\n\n");
+
+    return 0;
+}
diff --git a/c-embed/test.h b/c-embed/test.h
new file mode 100644
index 0000000000000000000000000000000000000000..cfdfa3a182039ef6cceae7d69378b46277394e0f
--- /dev/null
+++ b/c-embed/test.h
@@ -0,0 +1,49 @@
+unsigned char test_txt[] = {
+  0x54, 0x68, 0x65, 0x20, 0x66, 0x69, 0x72, 0x73, 0x74, 0x20, 0x72, 0x75,
+  0x6c, 0x65, 0x20, 0x69, 0x73, 0x20, 0x74, 0x79, 0x70, 0x69, 0x63, 0x61,
+  0x6c, 0x20, 0x6f, 0x66, 0x20, 0x71, 0x75, 0x61, 0x6e, 0x74, 0x75, 0x6d,
+  0x20, 0x70, 0x68, 0x79, 0x73, 0x69, 0x63, 0x73, 0x2e, 0x20, 0x49, 0x74,
+  0x20, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x73, 0x20, 0x66, 0x72, 0x6f,
+  0x6d, 0x20, 0x74, 0x68, 0x65, 0x20, 0x70, 0x6f, 0x73, 0x74, 0x75, 0x6c,
+  0x61, 0x74, 0x65, 0x20, 0x6f, 0x66, 0x0a, 0x75, 0x6e, 0x69, 0x74, 0x61,
+  0x72, 0x79, 0x20, 0x65, 0x76, 0x6f, 0x6c, 0x75, 0x74, 0x69, 0x6f, 0x6e,
+  0x2e, 0x20, 0x54, 0x68, 0x65, 0x20, 0x73, 0x65, 0x63, 0x6f, 0x6e, 0x64,
+  0x20, 0x72, 0x75, 0x6c, 0x65, 0x20, 0x69, 0x73, 0x20, 0x61, 0x20, 0x63,
+  0x6c, 0x61, 0x73, 0x73, 0x69, 0x63, 0x61, 0x6c, 0x20, 0x72, 0x75, 0x6c,
+  0x65, 0x20, 0x6f, 0x66, 0x20, 0x74, 0x68, 0x65, 0x20, 0x61, 0x64, 0x64,
+  0x69, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x6f, 0x66, 0x0a, 0x70, 0x72, 0x6f,
+  0x62, 0x61, 0x62, 0x69, 0x6c, 0x69, 0x74, 0x69, 0x65, 0x73, 0x2e, 0x20,
+  0x49, 0x74, 0x20, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x73, 0x20, 0x66,
+  0x72, 0x6f, 0x6d, 0x20, 0x64, 0x65, 0x63, 0x6f, 0x68, 0x65, 0x72, 0x65,
+  0x6e, 0x63, 0x65, 0x20, 0x74, 0x68, 0x72, 0x6f, 0x75, 0x67, 0x68, 0x20,
+  0x6f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2e,
+  0x20, 0x57, 0x68, 0x65, 0x6e, 0x0a, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6d,
+  0x65, 0x64, 0x69, 0x61, 0x74, 0x65, 0x20, 0x73, 0x74, 0x61, 0x74, 0x65,
+  0x73, 0x20, 0x61, 0x72, 0x65, 0x20, 0x6f, 0x62, 0x73, 0x65, 0x72, 0x76,
+  0x65, 0x64, 0x2c, 0x20, 0x74, 0x68, 0x65, 0x20, 0x6f, 0x62, 0x73, 0x65,
+  0x72, 0x76, 0x65, 0x64, 0x20, 0x73, 0x79, 0x73, 0x74, 0x65, 0x6d, 0x20,
+  0x69, 0x73, 0x20, 0x72, 0x65, 0x70, 0x72, 0x65, 0x73, 0x65, 0x6e, 0x74,
+  0x65, 0x64, 0x20, 0x62, 0x79, 0x20, 0x61, 0x0a, 0x6d, 0x69, 0x78, 0x74,
+  0x75, 0x72, 0x65, 0x20, 0x6f, 0x66, 0x20, 0x73, 0x74, 0x61, 0x74, 0x65,
+  0x73, 0x2e, 0x20, 0x54, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x61, 0x73, 0x73,
+  0x69, 0x63, 0x61, 0x6c, 0x20, 0x72, 0x75, 0x6c, 0x65, 0x20, 0x6f, 0x66,
+  0x20, 0x61, 0x64, 0x64, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x6f, 0x66,
+  0x20, 0x70, 0x72, 0x6f, 0x62, 0x61, 0x62, 0x69, 0x6c, 0x69, 0x74, 0x69,
+  0x65, 0x73, 0x20, 0x6d, 0x75, 0x73, 0x74, 0x20, 0x74, 0x68, 0x65, 0x6e,
+  0x20, 0x62, 0x65, 0x0a, 0x61, 0x70, 0x70, 0x6c, 0x69, 0x65, 0x64, 0x2e,
+  0x20, 0x45, 0x6e, 0x74, 0x61, 0x6e, 0x67, 0x6c, 0x65, 0x6d, 0x65, 0x6e,
+  0x74, 0x20, 0x62, 0x79, 0x20, 0x6f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61,
+  0x74, 0x69, 0x6f, 0x6e, 0x20, 0x74, 0x68, 0x75, 0x73, 0x20, 0x65, 0x78,
+  0x70, 0x6c, 0x61, 0x69, 0x6e, 0x73, 0x20, 0x46, 0x65, 0x79, 0x6e, 0x6d,
+  0x61, 0x6e, 0x27, 0x73, 0x20, 0x73, 0x65, 0x63, 0x6f, 0x6e, 0x64, 0x20,
+  0x72, 0x75, 0x6c, 0x65, 0x2e, 0x20, 0x54, 0x68, 0x69, 0x73, 0x0a, 0x65,
+  0x78, 0x70, 0x6c, 0x61, 0x69, 0x6e, 0x73, 0x20, 0x74, 0x68, 0x65, 0x20,
+  0x46, 0x65, 0x79, 0x6e, 0x6d, 0x61, 0x6e, 0x20, 0x52, 0x75, 0x6c, 0x65,
+  0x73, 0x20, 0x66, 0x6f, 0x72, 0x20, 0x63, 0x61, 0x6c, 0x63, 0x75, 0x6c,
+  0x61, 0x74, 0x69, 0x6e, 0x67, 0x20, 0x70, 0x72, 0x6f, 0x62, 0x61, 0x62,
+  0x69, 0x6c, 0x69, 0x74, 0x69, 0x65, 0x73, 0x20, 0x69, 0x6e, 0x20, 0x71,
+  0x75, 0x61, 0x6e, 0x74, 0x75, 0x6d, 0x20, 0x70, 0x68, 0x79, 0x73, 0x69,
+  0x63, 0x73, 0x0a, 0x28, 0x46, 0x65, 0x79, 0x6e, 0x6d, 0x61, 0x6e, 0x20,
+  0x31, 0x39, 0x36, 0x36, 0x29, 0x2e, 0x0a
+};
+unsigned int test_txt_len = 547;
diff --git a/c-embed/test.txt b/c-embed/test.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a3cac179a4aebeee77dd9032bcd85fc4e1795cfe
--- /dev/null
+++ b/c-embed/test.txt
@@ -0,0 +1,8 @@
+The first rule is typical of quantum physics. It results from the postulate of
+unitary evolution. The second rule is a classical rule of the addition of
+probabilities. It results from decoherence through observation. When
+intermediate states are observed, the observed system is represented by a
+mixture of states. The classical rule of addition of probabilities must then be
+applied. Entanglement by observation thus explains Feynman's second rule. This
+explains the Feynman Rules for calculating probabilities in quantum physics
+(Feynman 1966).
diff --git a/c-signals/.clang-format b/c-signals/.clang-format
new file mode 100644
index 0000000000000000000000000000000000000000..5f0e5858e8486f9ed0471951032c497a07a45ef1
--- /dev/null
+++ b/c-signals/.clang-format
@@ -0,0 +1,4 @@
+BasedOnStyle: Chromium
+ColumnLimit: 120
+IndentWidth: 4
+
diff --git a/c-signals/Makefile b/c-signals/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..afd71c3e7d9281f9d49601209f84496f094be05e
--- /dev/null
+++ b/c-signals/Makefile
@@ -0,0 +1,5 @@
+a.out:
+	gcc -Wall -Werror -Wpedantic main.c
+
+clean:
+	-rm a.out
diff --git a/c-signals/main.c b/c-signals/main.c
new file mode 100644
index 0000000000000000000000000000000000000000..a471016279ed7dc73cedaa5b1fed545cbd98ceaa
--- /dev/null
+++ b/c-signals/main.c
@@ -0,0 +1,21 @@
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+void handle_signal(int signal) {
+    printf("Signal received %d\n", signal);
+}
+
+// use “kill -10 pidof a.out“
+// https://www.man7.org/linux/man-pages/man7/signal.7.html
+int main(void) {
+    signal(SIGUSR1, handle_signal);
+    signal(SIGUSR2, handle_signal);
+
+    printf("Waiting for signals...\n");
+    for (;;)
+        sleep(1);
+
+    return 0;
+}
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000000000000000000000000000000000000..ae3a692902c9607a4843c813ccb19001430d0746
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,9 @@
+{ pkgs ? import <nixpkgs> {} }:
+	pkgs.mkShell {
+	nativeBuildInputs = with pkgs.buildPackages; [
+		binutils
+		gnumake
+		nasm
+		tinycc
+	];
+}