Docs: added showcase of how properties can be used

docs/user-guide/06-interfaces-generics.md

@@ -178,8 +178,25 @@ interface IFoo
 {
     property int count {get; set;}
 }
+
+struct MyObject : IFoo
+{
+    int myCount = 0;
+    property int count
+    {
+        get { return myCount; }
+        set { myCount = newValue; } 
+    }
+}
+```
+The above listing declares that any conforming type must define a property named `count` with both a `getter` and a `setter` method. You can then access the concrete value stored in the property as you would normally. 
+
+```csharp
+MyObject obj;
+obj.count = 2; 
+
+int count2 = obj.count; // count2 =  2
 ```
-The above listing declares that any conforming type must define a property named `count` with both a `getter` and a `setter` method.
 
 ### Generic Methods