Add Pico, a blazing fast, flat file CMS.

Pico is a stupidly simple, blazing fast, flat file CMS.

**GitHub:** https://github.com/gilbitron/Pico
**Website:** http://pico.dev7studios.com/
**Documentation:** http://pico.dev7studios.com/docs.html

Pico was made by @gilbitron from @Dev7studios. Released under the MIT license.