add initial examples, replacing the 'Demos/Demos3'. Will make it work cross-platform, OpenGL3/OpenGL2 and add more examples to it.

examples/HelloWorld/CMakeLists.txt

@@ -0,0 +1,29 @@
+# HelloWorld is a minimal sample creating, stepping and deleting a Bullet dynamics world
+
+INCLUDE_DIRECTORIES(
+${BULLET_PHYSICS_SOURCE_DIR}/src 
+)
+
+LINK_LIBRARIES(
+ BulletDynamics BulletCollision LinearMath 
+)
+
+IF (WIN32)
+	ADD_EXECUTABLE(AppHelloWorld
+		HelloWorld.cpp 
+		${BULLET_PHYSICS_SOURCE_DIR}/build3/bullet.rc
+	)
+ELSE()
+	ADD_EXECUTABLE(AppHelloWorld
+		HelloWorld.cpp 
+	)
+ENDIF()
+
+
+
+
+IF (INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)
+			SET_TARGET_PROPERTIES(AppHelloWorld PROPERTIES  DEBUG_POSTFIX "_Debug")
+			SET_TARGET_PROPERTIES(AppHelloWorld PROPERTIES  MINSIZEREL_POSTFIX "_MinsizeRel")
+			SET_TARGET_PROPERTIES(AppHelloWorld PROPERTIES  RELWITHDEBINFO_POSTFIX "_RelWithDebugInfo")
+ENDIF(INTERNAL_ADD_POSTFIX_EXECUTABLE_NAMES)