Adds a link to qmk.fm documentation with list of keycodes

keymaps/default/readme.md

@@ -13,4 +13,9 @@ The default `vckyb6` keymap is as follows:
   )
 ```
 
+The [qmk firmware 
+documentation](https://beta.docs.qmk.fm/using-qmk/simple-keycodes/keycodes_basic) 
+has a list of all possible keycodes.
+
 ![vckyb6 description](vckyb6-keymap.png)
+