Add .gitignore and Solution file

Verification:
    Launch Deps.sln and batch build - freetype, libpng and zlib should
    build without any issues.

Change-Id: I8676e0623cbe51ee8c5f99334f16937d06541dc6
Add .vcxproj for gtest

Verification:
    Successful batch build

Change-Id: If334e89baf951b128438e78bc246606f0761c955