Add short explainer at the top

README.md

@@ -1,6 +1,10 @@
 [![CodeCrafters.io](codecrafters-banner.png)](https://codecrafters.io)
 
-> What I cannot create, I do not understand — Richard Feynman.
+This repository is a compilation of guides for re-creating our favorite technologies from scratch. 
+
+It's a great way to learn. [Submit here](https://github.com/codecrafters-io/build-your-own-x/issues/new).
+
+> *What I cannot create, I do not understand — Richard Feynman.*
 
 ## Table of Contents