Create CONTRIBUTING.md

CONTRIBUTING.md

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+## Contributing
+
+Thanks for contributing!
+
+If you've never used [git](https://git-scm.com/), or a similar version control system, you may want to [read this simple guide](https://opensource.guide/how-to-contribute/#opening-a-pull-request)
+
+If you've never opened a pull request on github, you may want to [check out this video](http://makeapullrequest.com/)
+
+Creating a local copy of this project, be sure to install all dependencies using [yarn](https://yarnpkg.com/en/):
+```bash
+yarn install
+```
+
+Once you have all your dependencies installed, you can run a local docs server:
+```bash
+yarn start
+```