Added a Redis/Valkey extension named redis. (0.42.0)

examples/extensions/redis/README.md

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+Redis extension examples (hiredis)
+
+This folder contains small Fun scripts that demonstrate how to use the Redis extension.
+
+Prerequisites
+- Build Fun with Redis support enabled (FUN_WITH_REDIS=ON). This is ON by default in cmake/Extensions/REDIS.cmake.
+- A Redis-compatible server reachable at 127.0.0.1:6379.
+
+How to run
+- Using the Fun CLI from the repository root:
+  - Debug profile path: build_debug/fun
+  - Release profile path: build_release/fun
+
+Examples
+1. basic_ping.fun
+   - Connects, PINGs, then closes.
+
+2. kv_set_get.fun
+   - SET/GET, EXISTS and DEL for a demo key.
+
+3. list_ops.fun
+   - Demonstrates LPUSH and LRANGE on a list.
+
+4. hash_ops.fun
+   - Demonstrates HSET, HGET and HGETALL on a hash.
+
+Note
+- All examples use direct inline command strings with redis_cmd(handle, "COMMAND args...").
+- Close the connection with redis_close(handle) when finished.