Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to `gnt` :cocktail:
+Contributions all all kinds are welcome, whether it is code, issues, questions, logo design, bug-fixes, documentation, examples and more!
+
+### New Types
+You can add new types to `gnt` in one of two ways:
+1. Add a new package to `/packages` and include tests and a `package.json`
+2. Add a new dependency to `gnt` and expose it in `index.js`
+
+### Before submitting a PR
+1. If you are adding new logic, add or update the unit tests
+2. Run `npm run lint` and `npm run test` and make sure there are no errors