Added example how to add MongoDebugPanel

Author: syndbg

docs/index.rst

@@ -204,6 +204,16 @@ If you use the Flask-DebugToolbar you can add
 `'flask.ext.mongoengine.panels.MongoDebugPanel'` to the `DEBUG_TB_PANELS` config
 list and then it will automatically track your queries.
 
+    from flask import Flask
+    from flask_debugtoolbar import DebugToolbarExtension
+
+    app = Flask(__name__)
+    app.config['DEBUG_TB_PANELS'] = ['flask.ext.mongoengine.panels.MongoDebugPanel']
+    db = MongoEngine(app)
+    toolbar = DebugToolbarExtension(app)
+    
+
+
 Upgrading
 =========