README: Rewrite with more information
README: Rewrite with more information

Now includes features, installation instructions, usage
instructions, support links, author information and
license information.

Based on the README structure in the coala/coala repo.

Closes https://github.com/coala/coala-quickstart/issues/30

coala-analyzer/coala-quickstart,MalkmusT/coala-quickstart,MalkmusT/coala-quickstart,coala-analyzer/coala-quickstart