Create CONTRIBUTING.md

Author: na6im

CONTRIBUTING.md

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+# Contributing to React-floating-button
+We want to make contributing to this project as easy and transparent as
+possible.
+
+## Our Development Process
+We use GitHub to sync code to and from our internal repository. We'll use GitHub
+to track issues and feature requests, as well as accept pull requests.
+
+## Pull Requests
+We actively welcome your pull requests.
+
+1. Fork the repo and create your branch from `master`.
+2. If you've added code that should be tested, add tests.
+3. Ensure the test suite passes.
+5. Make sure your code lints.
+
+## Issues
+We use GitHub issues to track public bugs. Please ensure your description is
+clear and has sufficient instructions to be able to reproduce the issue. 
+If possible please provide a minimal demo of the problem.