added some indications in the README

README

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 An easily customizable alternative to Apple's UIPageControl
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+DDPageControl redefines exactly every property and methods available in UIPageControl.
+Using DDPageControl without customization will actually lead exactly to a UIPageControl.
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+However, the power of DDPageControl is that you can set some additional properties that will affect the way the look and feel of the page controls.
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+There are two color properties: one for 'on' controls and one for 'off' controls. You are free to pass an alpha channel for any of these colors'
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+You can also set the type of indicators you want as a filled circle or a simple ellipse.
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+Finally, the diameter of every indicator and their spacing is also customisable by setting a couple of properties.