Adding basic Xamarin.Android code example to docs (#15)

Update hello-xamarin-android.rst
Adding very basic code examples

Author: boguscoder

getting-started/hello-xamarin-android.rst

@@ -13,13 +13,63 @@ Add the ``OxyPlot.Xamarin.Android`` NuGet package to the project. References to
 
 Add a PlotView control
 ----------------------
+In your layout:
+
+.. sourcecode:: xml
+
+    <OxyPlot.Xamarin.Android.PlotView
+        android:id="@+id/plot_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
+
+then in your Activity/Fragment code:
+
+.. sourcecode:: csharp
+
+    using OxyPlot.Xamarin.Android;
+    /*...*/
+    PlotView view = FindViewById<PlotView>(Resource.Id.plot_view);
 
 
 Bind to a PlotModel
 -------------------
 
+.. sourcecode:: csharp
+
+    using OxyPlot;
+    using OxyPlot.Axes;
+    using OxyPlot.Series;
+    /*...*/		
+    view.Model = CreatePlotModel();
+        
+    private PlotModel CreatePlotModel()
+    {	
+        var plotModel = new PlotModel { Title = "OxyPlot Demo" };
+    
+        plotModel.Axes.Add(new LinearAxis { Position = AxisPosition.Bottom });
+        plotModel.Axes.Add(new LinearAxis { Position = AxisPosition.Left, Maximum = 10, Minimum = 0 });
+    
+        var series1 = new LineSeries
+        {
+            MarkerType = MarkerType.Circle,
+            MarkerSize = 4,
+            MarkerStroke = OxyColors.White
+        };
+    
+        series1.Points.Add(new DataPoint(0.0, 6.0));
+        series1.Points.Add(new DataPoint(1.4, 2.1));
+        series1.Points.Add(new DataPoint(2.0, 4.2));
+        series1.Points.Add(new DataPoint(3.3, 2.3));
+        series1.Points.Add(new DataPoint(4.7, 7.4));
+        series1.Points.Add(new DataPoint(6.0, 6.2));
+        series1.Points.Add(new DataPoint(8.9, 8.9));
+    
+        plotModel.Series.Add(series1);
+    
+        return plotModel;
+    }
 
 References
 ----------
 
-The source code can be found in the `HelloWorld\\AndroidApp1 <https://github.com/oxyplot/documentation-examples/tree/master/HelloWorld/AndroidApp1>`_ folder in the `documentation-examples <https://github.com/oxyplot/documentation-examples>`_ repository.
+The source code can be found in the `HelloWorld\\AndroidApp1 <https://github.com/oxyplot/documentation-examples/tree/master/HelloWorld/AndroidApp1>`_ folder in the `documentation-examples <https://github.com/oxyplot/documentation-examples>`_ repository.