add a few collision examples to test a C API with various back-ends

examples/Collision/CollisionTutorialBullet2.h

@@ -0,0 +1,12 @@
+#ifndef COLLISION_TUTORIAL_H
+#define COLLISION_TUTORIAL_H 
+
+enum EnumCollisionTutorialTypes
+{
+	TUT_SPHERE_SPHERE=0,
+	TUT_SPHERE_PLANE,
+};
+
+class	CommonExampleInterface*    CollisionTutorialBullet2CreateFunc(struct CommonExampleOptions& options);
+
+#endif //COLLISION_TUTORIAL_H