Update pocketvim.md

Author: atupal

tips/pocketvim.md

@@ -1,3 +1,17 @@
 
 https://github.com/NickTomlin/pocketvim
 
+
+
+```
+you can get editor editor object with 
+document.querySelector(".ace_editor.ace-github").env.editor 
+but setKeyboardHandler won't work since they use old ace version, so 
+you need to do this 
+
+ace.require("ace/lib/net").loadScript("https://rawgithub.com/ajaxorg/ace-builds/master/src-min-noconflict/keybinding-vim.js", 
+function() { 
+    e = document.querySelector(".ace_editor.ace-github").env.editor; 
+    e.setKeyboardHandler(ace.require("ace/keyboard/vim").handler); 
+}) 
+```