Create README.md for Ruby SDK project

Added README with project overview and usage notes.

Author: Jedt3D

README.md

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+# Read Me
+
+I'm a Ruby developer and want to use Z.ai models easily via SDK. One way to do it before is to use Ruby LLM, which is working well. But for the Ruby experience which should be able to correlated to Z.ai document and API, I should implement the Ruby SDK.
+
+## Please Note!
+- Most of them are automatically convert from Z.ai's Python SDK
+- I've just test it on Asahi Linux on Macbook Air M2 (`arm64`) only.
+- Ruby 3.4.8 via standard Arch package.
+
+So, enjoy and open issue if you see something wrong.
+
+Jedt <sjedt@3ddaily.com>