Add rules to build the perfect layout

Guides/ergo.md

@@ -1,3 +1,11 @@
 # Ergo Dox
 
 Guide for Ergo Dox keyboard.
+
+## Rules to create the perfect layout
+
+- Built on top of Dvorak layout
+- Easy to typing keys : space, enter
+- Fish : ctrl + f and alt + f or -> and alt + ->
+- Vim : escape or ctrl + c
+- Minimize transition between regular keyboard and ergodox