Documentation on how to compile AViewer

[jongund]

Can you put some documentation in the readme.md file on how to compile AViewer and a description of what each file does?

So if someone wanted to help or extend AViwer they would know where to start and how the code is organized.

[patrickhlauke]

@jun325 any pointers? even if it's only something rough (about how you compile it, any dependencies needed, etc) I can rewrite/organise/structure it a bit and add it to the wiki https://github.com/ThePacielloGroup/aviewer/wiki