Added example Processing applet

src/ExampleApplet.java

@@ -0,0 +1,26 @@
+
+import processing.core.*;
+
+public class ExampleApplet extends PApplet {
+
+    public static void main(String args[]) {
+        PApplet.main("ExampleApplet");
+    }
+
+    @Override
+    public void settings() {
+        size(200, 200);
+    }
+
+    @Override
+    public void setup() {
+        clear();
+    }
+
+    @Override
+    public void draw() {
+        clear();
+        fill(255);
+        rect(50, 50, 100, 100);
+    }
+}