Commiting Lesson 13 Visual Studio project

Could not compile the rendering framework using cmake or to render with
clang.  Possible can fix by writing a manual make file but until I try
that I will use windows.  Falling behind with work and can't have that!
Updated .gitignore

Removed project .sdf file

This is just a database of things for intellisense in visual studio, it is also
over the 100MB github limit.