Add SwiftCssParser (vsouza#1728)

README.md

@@ -1056,6 +1056,7 @@ Most of these are paid services, some have free tiers.
 * [URLEmbeddedView](https://github.com/marty-suzuki/URLEmbeddedView) - Automatically caches the object that is confirmed the Open Graph Protocol, and displays it as URL embedded card. :large_orange_diamond:
 * [SwiftyConfiguration](https://github.com/ykyouhei/SwiftyConfiguration) - Modern Swift API for Plist. :large_orange_diamond:
 * [JSONFeed](https://github.com/totocaster/JSONFeed) - Swift parser for JSON Feed, a format similar to RSS and Atom but in JSON. :large_orange_diamond:
+* [SwiftCssParser](https://github.com/100mango/SwiftCssParser) - A Powerful , Extensible CSS Parser written in pure Swift. :large_orange_diamond:
 
 ## Passbook
 * [passbook](https://github.com/frozon/passbook) - Passbook gem let's you create pkpass for passbook iOS 6+.