Adds the given color to the object bbn.var.colors in order to be able to use
Example
```javascript
//
background
text color
bbn.fn.addColors({maroon: '#800000'});
```
Adds the given color to the object bbn.var.colors in order to be able to use - the css classes bbn-bg-myColor for the background and bbn-myColor for the text color.
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