adding initial .less file

Requesting addition of LESS file. Did some simple variables and mixins to be used in the switch and toggle samples. This is for quick and easy customizing for other LESS developers. Implementing LESS in this file could be taken further, but I am seeing what you think about this before I do. I saw that you do have a SASS file already, and this would just be a different type of CSS preprocessor available for developers, not trying to replace your SASS in place.