Started components doc.

docs/components.md

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+Components
+===
+The Video.js player is built on top of a simple custom UI components architecture. The player class and all control classes extend the Component class, or a subclass of Component.
+
+```js
+_V_.Control = _V_.Component.extend({});
+_V_.Button = _V_.Control.extend({});
+_V_.PlayToggle = _V_.Button.extend({});
+```
+
+(The Class interface itself is provided using John Resig's [simple class inheritance](http://ejohn.org/blog/simple-javascript-inheritance/) also found in [JSNinja](http://jsninja.com).