📚 add contirbuting guide

CONTRIBUTING.md

@@ -0,0 +1,95 @@
+# Contribution Guide
+
+This is a guide on how to contribute to Sky Follower Bridge.  
+Contributions are welcome 🎉
+
+## Issues
+
+The following Issue is accepted.
+
+- Questions about features
+- Report errors or problems
+- Propose additions or improvements to feature
+
+Please click [here](https://github.com/kawamataryo/sky-follower-bridge/issues/new) to issue.
+
+## Pull Request
+
+Pull requests are always welcome.
+
+The following types of Pull Requests are accepted.  For basic Pull Requests (especially minor ones), you may send a Pull Request without creating an Issue.
+
+
+- Bug Fixes
+- Add functionality
+- Performance Fixes
+- Typo Fixes
+
+"How about this kind of fix/improvement?" If you have a question, please raise an Issue and discuss it with me.
+
+## How to send Pull Request
+
+Please follow these steps to create a pull request.
+
+1. Fork the repository
+2. Create a branch
+3. Add or modify feature
+4. Run e2e and unit test
+5. Check the feature in your browser
+5. Commit Changes
+6. Push branch
+7. Create Pull Request
+
+Also, when creating a pull request, please keep the following in mind
+
+- **One pull request per feature** - If you want to do more than one thing, send multiple pull requests.
+- **Add tests!** - If you add a feature, it would be great if you could write a test for it.
+- **Keep the same style** - eslint will automatically be ran before committing
+- **Document any change in behavior** - Make sure the `README.md` and any other relevant documentation are kept up-to-date.
+- **Send coherent history** - Make sure your commits message means something
+
+
+## How to set up a Local Development Environment
+
+First, clone the forked repository locally.
+
+```bash
+$ git clone https://github.com/kawamataryo/sky-follower-bridge.git
+```
+
+Install dependent modules with npm.
+If you do not have pnpm, please install it beforehand.
+
+```bash
+$ npm i
+```
+
+The dev command starts the development server.
+
+```bash
+$ npm run dev
+```
+
+When the development server starts, the Extension build results are output to the `extension`.
+
+You can use extensions in your browser by loading the contents of the extensions folder in Chrome Exteinsions.
+
+<img width="600" alt="image" src="https://github.com/kawamataryo/sky-follower-bridge/assets/11070996/ac90d0de-8957-41d4-bb53-571583106040">
+
+When you modify the code, the change is automatically reflected.
+
+## Release
+
+When the version file of [changesets](https://github.com/changesets/changesets) is merged into master, released to each store with a [GitHub Actions job](https://github.com/kawamataryo/sky-follower-bridge/blob/main/.github/workflows/publish.yml).
+
+1. add version file
+```
+npx changeset add
+```
+
+2. git push
+```
+git add .changesets
+git commit -m "🛠️  add changeets"
+git push origin master
+```