Added window example

Author: ShadyBoukhary

examples/WindowEx.java

@@ -0,0 +1,19 @@
+import com.arrayfire.*;
+
+public class WindowEx {
+    public static void main(String[] args) {
+      System.out.println("Creating window");
+      try {
+          Array img = new Array();
+          Data.randu(img, new int[] { 200, 200 }, Array.IntType);
+          Window window = new Window();
+          while (!window.closeWindow()) {
+              window.image(img, "Image");
+              window.show();
+          }
+          window.close();
+      } catch (Exception ex) {
+          ex.printStackTrace();
+      }
+    }
+}