Add make help screenshot

Author: ryanclark

README.md

@@ -14,6 +14,8 @@ of `make start` will build both Teleport and the frontend and have them up and r
 
 This should work on all backend versions of Teleport, and webapps from v10 onwards.
 
+![make help](images/make-help.png)
+
 ## Setup
 
 ### Directory Setup