Add a contribution guide and a maintainer's guide

CONTRIBUTING.md

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+# How to contribute to the Feature-Sliced Design CLI
+
+If you find bugs or want to propose new features, please [open an issue](https://github.com/feature-sliced/cli/issues).
+
+If you would like to make a code contribution, follow these steps:
+
+1. Fork this repository
+2. Make your changes
+3. Make sure the CLI builds correctly: `pnpm build`
+4. Add tests for your changes
+5. Make sure all tests pass: `pnpm test` and `pnpm test-integration`
+6. Describe your changes: `pnpm changeset`
+7. Make a pull request with your changes, including the changeset.

MAINTAINER_GUIDE.md

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+# Maintainer's Guide
+
+## Publishing a new version
+
+1. Run `pnpm changeset version` and review the changes
+2. Commit the changes and push to `main`
+3. Run `pnpm changeset publish`
+4. Push the tag to GitHub: `git push --follow-tags`