Import OculusRoomTiny source and project file

Also added .gitignore
Place a billiard table at the center of the room
Add unpainted fifteen balls on the table

Model::AddSphere() is borrowed from OculusCrystal's codes.
Squashed 'libpng/' content from commit 915f083

git-subtree-dir: libpng
git-subtree-split: 915f0832fe34fe60a135aea88f1c4298b8256dfe
Merge commit '5946ab338382426acf5a9c473a66c538ffde26aa' as 'libpng'
Adapt libpng for our application

Specifically, the project file is converted to VC2012.
Load cloth image in PNG format
Paint balls with a texture

They all look the same!