adding links

README.md

@@ -20,7 +20,7 @@ Don't put a lot of code in the application directory. If you think the code can
 
 It's common to have a small `main` function that imports and invokes the code from the `/internal` and `/pkg` directories and nothing else.
 
-See the `/cmd` directory for examples.
+See the [`/cmd`](cmd/README.md) directory for examples.
 
 ### `/internal`