Graphics
* Load obj files
    * Vertex coordinates, normals and textures
    * read faces with more than 4 vertices
    * Read object materials

- Render a set of vertices loaded from a file
    * Render vertex coordinates
    * Render Normal vectors
    - Render vertex Textures

Linear
- Implement the Inverse function of mat4
- Implement the determinant function of mat4
* Implement Orhographic view transformation