Merge pull request #1525 from MunGell/add-readme-edit-warning

Add warning for people editing the README.md file

.github/README-template.j2

@@ -1,3 +1,8 @@
+<!-- DO NOT EDIT THIS FILE (README.md) -->
+<!-- ALL ENTRIES SHOULD BE IN TO THE data.json -->
+<!-- SEE THE CONTRIBUTING GUIDE (CONTRIBUTING.md) FOR MORE GUIDANCE -->
+<!-- YOU MAY IGNORE THIS MESSAGE IF YOU ARE EDITING THE TEMPLATE -->
+
 # Awesome First PR Opportunities [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/sindresorhus/awesome)
 
 Inspired by [First Timers Only](https://kentcdodds.com/blog/first-timers-only) blog post.