Ensure Redis has stage 2 solutions and hints for all languages

[TropicolX]

Note

Introduce stage-2 solutions that accept a client and respond with +PONG\r\n, plus build/run scaffolding and language-specific hints for all supported languages.

• Stage 2 Implementations (multi-language):
  • Add minimal servers that accept a client and send +PONG\r\n in C, C++, C#, Clojure, Crystal, Elixir, Gleam, Haskell, Java, Kotlin, OCaml, Odin, PHP, Ruby, Scala, Swift, TypeScript, Zig.
• Tooling & Scaffolding:
  • Add language-specific build/run scripts (.codecrafters/compile.sh, .codecrafters/run.sh, your_program.sh).
  • Add project configs/manifests (e.g., CMakeLists.txt, stack.yaml, build.sbt, Package.swift, Gradle/SBT configs, deps.edn, gleam.toml, dune files, etc.).
  • Add per-language codecrafters.yml and .gitignore/.gitattributes.
• Docs & Hints:
  • Update/add README.md for each language with run instructions.
  • Add config.yml hints demonstrating how to accept a connection and send +PONG\r\n.

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[rohitpaulk]

Let's not change existing ones, only add the new ones - looks good otherwise!