Add to contributor info

CONTRIBUTING.md

@@ -1,6 +1,8 @@
-This is a basic checklist for now, We will update it in future.
+This is a basic checklist for now, We will update it in the future.
 
 * Fork the repo and create your new branch based on the `development` branch.
+* Commit Unix line endings
+* If you want, try to keep to the theme of black holes/gravity. This can add some fun to your submission.
 * Submit Pull Requests to the development branch only.
 * Before Submitting your Pull Request, merge `development` with your new branch and fix any conflicts. (Make sure you don't break anything in development!)
 * Be patient. We will review all submitted pull requests, but our focus is on stability.. please don't be offended if we reject your PR, or it appears we're doing nothing with it! We'll get around to it..