docs(read.me): Add blurb about setup function and event binding

Closes 201

Author: deeg

README.md

@@ -77,6 +77,23 @@ _The ui-tinymce directive stores the configuration options as specified in the [
 
 The directive supports all of the standard TinyMCE initialization options as listed [here](http://www.tinymce.com/wiki.php/Configuration).
 
+Use the [setup](https://www.tinymce.com/docs/configure/integration-and-setup/#setup) function to bind different events:
+
+```javascript
+scope.tinymceOptions = {
+  setup: function(editor) {
+      //Focus the editor on load
+      $timeout(function(){ editor.focus(); });
+      editor.on("init", function() {
+        ...
+      });
+      editor.on("click", function() {
+        ...
+      });
+  }
+};
+```
+
 In addition, it supports these additional optional options
 
 - `format` Format to get content as, i.e. 'raw' for raw HTML, or 'text' for text only. Defaults to 'html'. Documentation [here](http://www.tinymce.com/wiki.php/api4:method.tinymce.Editor.getContent)