Gitting started

Getting started working on astroplan has been a mix of reading up on work people have already done (https://github.com/astropy/astroplan/pull/137, https://github.com/astropy/astroplan/pull/151), brainstorming scheduling styles, planning using astroplan, and figuring out how git works. Working with git has been interesting and being told what to do by Brett Morris and by Github has been very useful in learning the flow of pulling, branching, committing, pushing etc. I'm looking forward to start coding in earnest as a developer.