Add Pony-Game Solution and pony-game-main SFML project with a basic Main.cpp
Add google test functionality to the project

Added three project:
google-test		- library for the google test code
pony-game-core	- library for the game's core code
pony-game-test  - executable for testing popurposes

The google code source is included dynamicly,
and <gtest_dir> should be placed up one level relative to the repo
like so: <repo_path>../<gtest_dir>