Add Redis source code for testing

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+This directory contains JSON files, one for each of Redis commands.
+
+Each JSON contains all the information about the command itself, but these JSON files are not to be used directly!
+Any third party who needs access to command information must get it from `COMMAND INFO` and `COMMAND DOCS`.
+The output can be extracted in a JSON format by using `redis-cli --json`, in the same manner as in `utils/generate-commands-json.py`.
+
+The JSON files are used to generate commands.def (and https://github.com/redis/redis-doc/blob/master/commands.json) in Redis, and
+despite looking similar to the output of `COMMAND` there are some fields and flags that are implicitly populated, and that's the
+reason one shouldn't rely on the raw files.
+
+The structure of each JSON is somewhat documented in https://redis.io/commands/command-docs/ and https://redis.io/commands/command/
+
+The `reply_schema` section is a standard JSON Schema (see https://json-schema.org/) that describes the reply of each command.
+It is designed to someday be used to auto-generate code in client libraries, but is not yet mature and is not exposed externally.
+