Add angular

This pull request adds Angular as our application framework.

I believe Angular is a good framework, with good documentation and a growing community. I don't know a thing about it, but I watched [a pretty cool tutorial](https://www.youtube.com/watch?v=i9MHigUZKEM) that got me interested. I created this pull request in a matter of 30 minutes - so I don't think it is very hard to get something up and running.

This patch also adds build instructions in the readme.