Add example of emacs binding

examples/emacs_binding.rb

@@ -0,0 +1,9 @@
+window class_not: 'urxvt' do
+  remap 'C-b', to: 'Left'
+  remap 'C-f', to: 'Right'
+  remap 'C-p', to: 'Up'
+  remap 'C-n', to: 'Down'
+
+  remap 'C-a', to: 'Home'
+  remap 'C-e', to: 'End'
+end