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

examples/OpenGLWindow/Shaders/createShadowMapInstancingPS.glsl

@@ -0,0 +1,10 @@
+#version 330
+precision highp float;
+
+
+layout(location = 0) out float fragmentdepth;
+
+void main(void)
+{
+	fragmentdepth = gl_FragCoord.z;
+}