WEIgnore: Add item template for this file

Create a .weignore file with a few examples from WebEssentials documentation (madskristensen/vswebessentials.com#62) 

This will close #145 

Can someone explain me what is the [emplate-report.xml](https://github.com/ligershark/side-waffle/blob/master/TemplatePack/template-report.xml) file for? Do I really need to include it with my commit? Seem never up-to-date.