Add Xah Lee reference page

README.md

@@ -22,6 +22,7 @@
 -   [@kinesisergo on Twitter](https://twitter.com/kinesisergo) - Kinesis Ergo on Twitter
 -   [Kinesis Advantage - Everything you want to know but are afraid to task!](https://geekhack.org/index.php?topic=8110.0) - Detailed geekhack thread
 -   [Kinesis Contoured on Deskthority](https://deskthority.net/wiki/Kinesis_Contoured) - Deskthority article
+-   [Kinesis Keyboard Key Remap/Macro/Layout How-To](http://xahlee.info/kbd/kinesis_keyboard_howto.html) - Detailed guide on switching layouts, remapping keys, setting macros and more.
 -   [Mechanical Aspects of Kinesis Advantage keys](https://www.fysh.org/~zefram/keyboard/advantage_keys_mech.txt) - Details on the physical and mechanical makeup of the keys
 
 ## Shopping