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/pbr.vs

@@ -0,0 +1,49 @@
+/*******************************************************************************************
+*
+*   rPBR [shader] - Physically based rendering vertex shader
+*
+*   Copyright (c) 2017 Victor Fisac
+*
+**********************************************************************************************/
+
+#version 330
+
+// Input vertex attributes
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec3 vertexNormal;
+in vec4 vertexTangent;
+
+// Input uniform values
+uniform mat4 mvp;
+uniform mat4 matModel;
+
+// Output vertex attributes (to fragment shader)
+out vec3 fragPosition;
+out vec2 fragTexCoord;
+out vec3 fragNormal;
+out vec3 fragTangent;
+out vec3 fragBinormal;
+
+void main()
+{
+    // Calculate binormal from vertex normal and tangent
+    vec3 vertexBinormal = cross(vertexNormal, vec3(vertexTangent));
+
+    // Calculate fragment normal based on normal transformations
+    mat3 normalMatrix = transpose(inverse(mat3(matModel)));
+
+    // Calculate fragment position based on model transformations
+    fragPosition = vec3(matModel*vec4(vertexPosition, 1.0f));
+
+    // Send vertex attributes to fragment shader
+    fragTexCoord = vertexTexCoord;
+    fragNormal = normalize(normalMatrix*vertexNormal);
+    fragTangent = normalize(normalMatrix*vec3(vertexTangent));
+    fragTangent = normalize(fragTangent - dot(fragTangent, fragNormal)*fragNormal);
+    fragBinormal = normalize(normalMatrix*vertexBinormal);
+    fragBinormal = cross(fragNormal, fragTangent);
+
+    // Calculate final vertex position
+    gl_Position = mvp*vec4(vertexPosition, 1.0);
+}