Add contributing doc

Samuel Maddock · web-flow · commit 2cb55d866cd8 · 2018-05-22T14:27:17.000-04:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -0,0 +1,9 @@
+To contribute, fork our project on GitHub, then submit a pull request to our `master` branch.
+
+Before submitting a pull request, please make sure you have tested your changes.
+
+---
+
+By submitting a pull request, you represent that you have the right to license
+your contribution to WillowTree and the community, and agree by submitting the patch
+that your contributions are licensed under the [MIT license](LICENSE).
