New API docs

Up until today, fman's API documentation consisted of a very short list of available functions without any examples or explanations. In the past two weeks, the docs were finally fleshed out. They're very comprehensive now and provide lots of examples. Check them out!

Michael started fman in 2016, convinced that we deserve a better file manager. fman's launch in 2017 was a huge success. But despite full-time work, it only makes $350 per month. The goal for 2018 is to fix this.