Redo readme

Starting the work I mentioned in #26
Same for this section as well, it will need to be multi-step. Should we require form-submission for everyone so we have the mentor/mentee expectations set? 

1. Go to form and sign-up
2. Submit PR to readme listing as mentor
3. A little patience and you'll receive your match! Or at least an email that we're working on it/don't have anyone currently needing a mentor but we'll contact when the match seems right.