BrightSharp.Toolkit/docs/help/zoomcontrol.md

### ZoomControl usage example

Example:
```xaml
<diag:ZoomControl xmlns:diag="http://schemas.brightsharp.com/diagrams"
                    xmlns:bs="http://schemas.brightsharp.com/developer">
    <Canvas>
        <Ellipse Canvas.Left="37" Canvas.Top="110" Width="100" Height="100" Fill="Blue" />
        <Rectangle Canvas.Left="193" Canvas.Top="55" Width="100" Height="100" Fill="Black" />
    </Canvas>
</diag:ZoomControl>
```