Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+When contributing to this repository, please first discuss the change you wish to make via [issue](https://github.com/stanleyowen/todo-application/issues), [email](mailto:[email protected]), or any other method with the owners of this repository before making a change. 
+
+Please note we have a [code of conduct](CODE_OF_CONDUCT.md), please follow it in all your interactions with the project.
+
+## Pull Request Process
+
+1. Start contributing to this repository by forking this repository first
+2. Before creating issue(s) or PR(s), please search if the issue(s) / PRs have existed
+3. Please create an issue about how your idea(s) nor issue(s)
+4. Instead of uploading `.env` file, please describe it in the description part
+5. Submit your pull request