Add CONTRIBUTING.md (#15)

Author: gaojude

CONTRIBUTING.md

@@ -0,0 +1,24 @@
+# Contributing
+
+## Adding Changes
+
+1. Make your changes in a PR
+2. If your change affects users (features, fixes, breaking changes), add a changeset:
+   ```bash
+   npx changeset
+   ```
+3. Commit the generated `.changeset/*.md` file with your PR
+
+Skip the changeset for internal changes (CI, tests, docs, refactors with no API impact).
+
+## Releasing
+
+When changesets are merged to `main`, a "Version Packages" PR is automatically created/updated.
+
+Merging that PR:
+- Bumps the version in `package.json`
+- Updates `CHANGELOG.md`
+- Publishes to npm
+- Creates a GitHub Release
+
+You control when to release by choosing when to merge the "Version Packages" PR. Multiple changesets can accumulate before releasing.

README.md

@@ -445,6 +445,10 @@ This writes a `.env.local` file with all the required environment variables (AI_
 
 **Test incrementally**: Start with simple tasks, add complexity as you learn what works.
 
+## Contributing
+
+See [CONTRIBUTING.md](CONTRIBUTING.md) for development workflow and release process.
+
 ## License
 
 MIT