Update README.md

Added link to blog post

Author: michaelkay

README.md

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 # Overview
 greensnap is a set of shell scripts that create timelapse and security camera videos. Setup is easy but does require some knowledge of the Linux command prompt.
 
+For a full description see this post http://raspberrypimaker.com/simple-security-camera/
+
 ## Prerequesits
 These scripts run on most Linux systems including the RaspberryPi. The Raspi camera is supported.
 - Some type camera. Webcams, IP cameras and the RaspberryPi camera is supported