A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
Check this tutorial http://blog.hfarazm.com/git-for-unity-create-projects/
Simple Method: 1. Goto directory where you installed android sdk version 20.0.0 : in my case I installed at : D:\Program Files...
omg i reinstalled monodevelop twice. thanks