add scala code example

--HG--
branch : pmacs2

code_examples/example.scala

@@ -0,0 +1,15 @@
+a:Array = Array(1,2,3,4)
+
+@annotation
+abstract class Square {
+  def alpha(x:Int, y:Int) {
+  }
+}
+
+trait Green {
+  def getColor: 'green
+}
+
+class GreenSquare(width:Int, height:Int) extends Square with Green {
+
+}