Add LearnOpenGL ports to Odin

[karl-zylinski]

Port https://learnopengl.com/ to Odin (using OpenGL and GLFW)

Can be done in phases. For example, you can do one section at a time: "Getting Started", "Lighting" etc. You'd end up with a folder structure like this:

opengl/
  learn_opengl/
    1_getting_started/
       // one folder per part
    2_lighting/
       // one folder per part

    // etc

This way one can start with 1_getting_started and make sure it is good before moving on.