Update README.md

Added a quickstart section and some example code

Author: wischi-chr

README.md

@@ -2,3 +2,55 @@
 
 StreamDeckSharp is a simple (unofficial) .NET interface for the Stream Deck (https://www.elgato.com/de/gaming/stream-deck).
 This project is not related to _Elgato Systems GmbH_ in any way.
+
+## Quickstart _(TL;DR)_
+***At the moment only Windows is supported (tested with 10, should also work with 7 and 8)***
+1. Add StreamDeckSharp reference (via nuget or download latest release)
+2. Add a using directive for StreamDeckSharp: `using StreamDeckSharp;`
+
+I want to...              | Code (C#)
+------------------------- | ---------------------------------------------------------
+create a device reference | `var deck = StreamDeck.FromHID();`  
+set the brightness        | `deck.SetBrightness(50);`
+create bitmap for key     | `var bitmap = StreamDeckKeyBitmap.FromFile("icon.png")`
+set key image             | `deck.SetKeyBitmap(keyId,bitmap)`
+clear key image           | `deck.ClearKey(keyId)`
+process key events        | `deck.KeyPressed += KeyHandler;`
+
+**Make sure to dispose the device reference correctly** _(use `using` whenever possible)_
+
+## Examples
+If you want to see some examples take a look at the example projects in the repo.  
+Here is a short example called "Austria". Copy the code and start hacking ;-)
+
+```C#
+using StreamDeckSharp;
+
+namespace StreamDeckSharp.Examples.Austria
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            //Create some color we use later to draw the flag of austria
+            var red = StreamDeckKeyBitmap.FromRGBColor(237, 41, 57);
+            var white = StreamDeckKeyBitmap.FromRGBColor(255, 255, 255);
+            var rowColors = new StreamDeckKeyBitmap[] { red, white, red };
+
+            //Open the Stream Deck device
+            using (var deck = StreamDeck.FromHID())
+            {
+                deck.SetBrightness(100);
+
+                //Send the bitmap informaton to the device
+                for (int i = 0; i < deck.NumberOfKeys; i++)
+                    deck.SetKeyBitmap(i, rowColors[i / 5]);
+            }
+        }
+    }
+}
+```
+
+Here is what the "Rainbow" example looks like after pressing some keys
+
+![Rainbow example photo](doc/images/rainbow_example.png?raw=true "Rainbow demo after pressing some keys")