Addin for Outlook 2010

I searched for a simple sample outlook addin project in the internet. But I was not able to find one. And those which were available were not working in my machine. So I thought I will post an article which has an addin project available to download.
This outlook addin is a simple addin which will add a Button in the outlook and will display a Hello World message. This Addin is for Outlook 2010. The main problem which I found in Outlook 2010 was that, the Addins are coming in a separate Tab called AddTab. So every time the user wants to use the Addin, he need to navigate to this Tab and then click the Addin button.
So I have made this Addin to appear in the default MailTab which is the home tab. Have made use of ribbon xml to display the Addin button.