Add development documentation

[zeke]

When trying to run the test suite using bundle exec rake or bundle exec rake test or bundle exec rake spec, I see no output. What command should I be using to run the tests?

fontcustom master* $ bundle exec rake
/Users/zeke/.rvm/rubies/ruby-1.9.3-p194/bin/ruby -I"lib:lib/fontcustom:spec:spec/fixtures" -I"/Users/zeke/.rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.2/lib" "/Users/zeke/.rvm/gems/ruby-1.9.3-p194/gems/rake-10.0.2/lib/rake/rake_test_loader.rb" "spec/fontcustom/fontcustom_spec.rb" "spec/fontcustom/generator_spec.rb" 

fontcustom master* $ ruby -v
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.4.0]

This kind of information should probably go in CONTRIBUTING.MD, per Github's new contributing guidelines.

[kaizau]

Thanks for bringing this up. We're using guard for the moment, though tests are overdue for an update. CONTRIBUTING.md has been added.

[zeke]

👍