Add link to starcheat

starcheat has a couple of modules that can be used in other projects:
 - saves.py: read/write support for .player save files
 - assets.py: uses py-starbound, but adds indexing assets and stuff like generating unique items
afaik starcheat is the only open source code so far to do this so may be of interest to others
Merge pull request #23 from wizzomafizzo/gh-pages

Add link to starcheat