chore: コミュニティー関係のものを追加

.github/CONTRIBUTING.md

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+# Contribution guide
+
+Thank you for considering contributing to MiPAC!!!
+
+## Issue
+
+Check the going points before creating an assignment
+
+- To avoid duplicates, please search for similar Issues
+- Do not use Issue for questions, etc.
+    - We welcome your questions in GitHub Discussion or on the Discord server in the README.
+
+
+## About Brunch
+
+- `master` is a branch intended for use in a production environment
+- `develop` is the branch to work on for the next release
+    - If you want to create a pull request, please send it to this branch
+
+## Creating a pull request
+
+- Create an Issue before creating a pull request.
+- Please prefix the branch name with a keyword such as `feat` / `fix` / `refactor` / `chore` to identify the pull request as much as possible.  
+    - Also, do not include changes other than to resolve the pull request issue
+- If you have an Issue that will be resolved by a pull request, please include a link
+- Any changes should be described in `CHANGELOG.md`. However, if there is no change from the user's point of view, there is no need to describe it.
+- If possible, please use `flake8`, `mypy`, etc. to lint in your local environment.
+
+Thank you for your cooperation.
+
+## Notes
+
+### About the Format
+
+This project uses `axblack` and `isort` formatting. The difference between `axblack` and `black` is whether double or single quotes are used.
+
+### About supported Misskey versions
+
+- Ayuskey v5, 6
+- Misskey v13, 12, 11

.github/PULL_REQUEST_TEMPLATE.md

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+## Ticket link
+
+# What's Change
+
+<!-- a normal html comment -->
+
+## Checklist
+
+- [ ] Read the contribution guide
+- [ ] (If needed) Update CHANGELOG.md