Update CONTRIBUTING.md

Author: basarat

CONTRIBUTING.md

@@ -116,3 +116,7 @@ Quick fixes need to implement the `QuickFix` interface ([code here](https://gith
 Once you have the quickfix created just put it into the [quickfix registry](https://github.com/TypeStrong/atom-typescript/blob/a91f7e0c935ed2bdc2c642350af50a7a5aed70ad/lib/main/lang/fixmyts/quickFixRegistry.ts#L14-L24) so that the infrastructure picks it up.
 
 **Additional Tips** : One indespensible tool when creating a quick fix is the [AST viewer](https://github.com/TypeStrong/atom-typescript#ast-visualizer) which allows you to investigate the TypeScript language service view of the file.
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+# Video
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+A video on some of the internals : https://www.youtube.com/watch?v=WOuNb2MGR4o