Configure Doxygen to generate documentation

[abinashmeher999]

We have very poor documentation of our code and that too everything is within the code. So, exploring the codebase is tough.

We need to begin documenting any further code written and generate the documentation page from that. We will be using doxygen style documentation inside the source, generate html pages from it using doxygen and host it on gh-pages.

The task is to

• Write the config file for doxygen
• Properly host it on gh-pages

This is a fairly easy task.