Add exercise 14-12 (star class) to the repo

This exercise is in the book but was missing from the repository.

Author: multimentha

chp14_transformations/exercise_14_12_star_class/exercise_14_12_star_class.pde

@@ -0,0 +1,28 @@
+// Learning Processing
+// Daniel Shiffman
+// http://www.learningprocessing.com
+
+// Exercise 14-12: Rewrite Example 14-19 so that the 
+// PShape object itself is inside your own Star class
+// that also includes x,y variables for position.
+// Make multiple instances of the object an array.
+// Here is some code to get you started.
+
+class Star {
+  // The PShape object
+  PShape s;
+  // The location where I will draw the shape
+  float x,y;
+
+  Star() {
+    // What goes here?
+  }
+
+  void move() {
+    // What goes here?
+  }
+
+  void display() {
+    // What goes here?
+  }
+}