Update usage section on readme

wylieconlon · Feb 14, 2012 · 0532281 · 0532281
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+About
+-----
+
 An exercise in implementing a forward and inverse kinematics simulation in Javascript. Uses the [Raphael](http://raphaeljs.com/) SVG framework.
 
+Usage
+-----
+
+### Forward kinematics:
+
+Click on a joint, then use the left and right arrow keys to rotate.
+
+Up and down arrow keys add/subtract joints
+
+License
+-------
+
 All code is MIT licensed unless otherwise noted.