adding the less/sass skeleton links to the readme

README.md

@@ -49,6 +49,13 @@ The above list is non-exhaustive. Skeleton works perfectly with almost all older
 All parts of Skeleton are free to use and abuse under the [open-source MIT license](https://github.com/dhg/Skeleton/blob/master/LICENSE.md).
 
 
+## Extensions
+
+The following are extensions to Skeleton built by the community. They are not officially supported, but all have been tested and are compatible with v2.0 (exact release noted):
+- [Skeleton on LESS](https://github.com/whatsnewsaes/Skeleton-less): Skeleton built with LESS for easier replacement of grid, color, and media queries. (Last update was to match v2.0.1)
+- [Skeleton on SASS](https://github.com/whatsnewsaes/Skeleton-Sass): Skeleton built with SASS for easier replacement of grid, color, and media queries. (Last update was to match v2.0.1)
+
+
 ## Colophon
 
 Skeleton was built using [Sublime Text 3](http://www.sublimetext.com/3) and designed with [Sketch](http://bohemiancoding.com/sketch). The typeface [Raleway](http://www.google.com/fonts/specimen/Raleway) was created by [Matt McInerney](http://matt.cc/) and [Pablo Impallari](http://www.impallari.com/). Code highlighting by Google's [Prettify library](https://code.google.com/p/google-code-prettify/). Icons in the header of the documentation are all derivative work of icons from [The Noun Project](http://thenounproject.com). [Feather](http://thenounproject.com/term/feather/22073) by Zach VanDeHey, [Pen](http://thenounproject.com/term/pen/21163) (with cap) by Ed Harrison, [Pen](http://thenounproject.com/term/pen/32847) (with clicker) by Matthew Hall, and [Watch](http://thenounproject.com/term/watch/48015) by Julien Deveaux.