Added Physics Engine to Main folder referenced by main; Added AI files to repository - the ones I had;

Physics engine hooked in to both the main folder and the GSPMain-master;
AI files added to GSPCAGE Folder - includes corrected - two files I
didn't have 1.) MovingEntity.h, 2.) Game.h one called in Projectiles.h
the other in Projectiles.cpp; don't have so couldn't add, laft the rest
as I found it:)