Add CrawlerDetect

README.md

 * [Agent](https://github.com/jenssegers/agent) - A PHP desktop/mobile user agent parser, based on Mobiledetect.
 * [ANSI to HTML5](https://github.com/sensiolabs/ansi-to-html) - An ANSI to HTML5 converter library.
 * [Color Jizz](https://github.com/mikeemoo/ColorJizz-PHP) - A library for manipulating and converting colours.
+* [CrawlerDetect](https://github.com/JayBizzle/Crawler-Detect) - A PHP class for detecting bots/crawlers/spiders via the user agent.
 * [Device Detector](https://github.com/piwik/device-detector) - Another library for parsing user agent strings.
 * [Hoa String](https://github.com/hoaproject/Ustring) - Another UTF-8 string library.
 * [Jieba-PHP](https://github.com/fukuball/jieba-php) - A PHP port of Python's jieba. Chinese text segmentation for natural language processing.