Docs

[fgrunewald]

First round of documentation

[pckroon]

To get this going on Readthedocs:
0) add a .readthedocs.yaml (https://github.com/marrink-lab/vermouth-martinize/blob/master/.readthedocs.yaml)

1. go to readthedocs.org and login using github
2. import the project/repository
3. mess around with the settings (under admin) until you're happy.

[fgrunewald]

docs need rbasing and with this branch it leads to a gazillion conflicts