Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Letta Code
+
+## Fork the repo
+
+Fork the repository on GitHub by [clicking this link](https://github.com/letta-ai/letta-code/fork), then clone your fork:
+
+```bash
+git clone https://github.com/your-username/letta-code.git
+cd letta-code
+```
+
+## Installing from source
+
+Requirements:
+* [Bun](https://bun.com/docs/installation)
+
+### Run directly from source (dev workflow)
+```bash
+# install deps
+bun install
+
+# run the CLI from TypeScript sources (pick up changes immediately)
+bun run dev
+bun run dev -- -p "Hello world"  # example with args
+```
+
+### Build + link the standalone binary
+```bash
+# build bin/letta (includes prompts + schemas)
+bun run build
+
+# expose the binary globally (adjust to your preference)
+bun link
+
+# now you can run the compiled CLI
+letta
+```
+
+Whenever you change source files, rerun `bun run build` before using the linked `letta` binary so it picks up your edits.