Changing examples to use makefile

- Testing a modified version of the makefile from raylib Instead of multiple project files for examples.
- Fixed readme example

Examples/models/resources/shaders/brdf.vs

@@ -0,0 +1,25 @@
+/*******************************************************************************************
+*
+*   rPBR [shader] - Bidirectional reflectance distribution function vertex shader
+*
+*   Copyright (c) 2017 Victor Fisac
+*
+**********************************************************************************************/
+
+#version 330
+
+// Input vertex attributes
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+
+// Output vertex attributes (to fragment shader)
+out vec2 fragTexCoord;
+
+void main()
+{
+    // Calculate fragment position based on model transformations
+    fragTexCoord = vertexTexCoord;
+
+    // Calculate final vertex position
+    gl_Position = vec4(vertexPosition, 1.0);
+}