Add CONTRIBUTING.md

.github/CONTRIBUTING.md

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+# Contributing to AdminKit
+
+If you're reading this, you're awesome! Thank you for helping us make this project great. Here are a few guidelines that will help you along the way.
+
+## Submitting a Pull Request
+
+* Include **screenshots** or animated GIFs in your pull request whenever possible
+* Use the **present** tense ("Add feature" not "Added feature")
+* Use the **imperative** mood ("Move cursor to..." not "Moves cursor to...")
+* Limit the first line to 72 characters or fewer
+* Reference issues and pull requests liberally
+
+## Try your changes
+
+When modifying any of the files located in the `/src` folder, you will need to recompile the assets. You can do this by running:
+
+```
+npm install
+npm run build
+```