Update readme

Source/OLED128x32Wing/Driver/Readme.md

@@ -8,3 +8,34 @@ The **Meadow.Foundation** peripherals library is an open-source repository of dr
 
 For more information on developing for Meadow, visit [developer.wildernesslabs.co](http://developer.wildernesslabs.co/), to view all Wilderness Labs open-source projects, including samples, visit [github.com/wildernesslabs](https://github.com/wildernesslabs/)
 
+## Usage
+
+```
+OLED128x32Wing oledWing;
+MicroGraphics graphics;
+
+public override Task Initialize()
+{
+    Console.WriteLine("Initializing ...");
+    var i2cBus = Device.CreateI2cBus(I2cBusSpeed.FastPlus);
+
+    oledWing = new OLED128x32Wing(i2cBus, Device.Pins.D11, Device.Pins.D10, Device.Pins.D09);
+
+    graphics = new MicroGraphics(oledWing.Display);
+    graphics.CurrentFont = new Font12x16();
+
+    oledWing.ButtonA.Clicked += (sender, e) => UpdateDisplay("A pressed");
+    oledWing.ButtonB.Clicked += (sender, e) => UpdateDisplay("B pressed");
+    oledWing.ButtonC.Clicked += (sender, e) => UpdateDisplay("C pressed");
+
+    return Task.CompletedTask;
+}
+
+void UpdateDisplay(string message)
+{
+    graphics.Clear();
+    graphics.DrawText(0, 8, message);
+    graphics.Show();
+}
+
+```