Added Python Tools for Visual Studio

Python Tools for Visual Studio (PTVS) is a free, open source plugin that turns Visual Studio into a Python IDE. It has been designed, developed, and is supported by Microsoft and the community.

PTVS uses .pyproj files to reference all source and content files associated with a project (see http://pytools.codeplex.com/wikipage?title=Features%20Projects). These files are environment-specific and, much like .sln files, should not be included in version control.

More info: https://pytools.codeplex.com/