add key_action

Lektion 2/Key_action/black_white_1/black_white_1.pde

@@ -0,0 +1,15 @@
+int bg = 200;//bg = background
+
+void draw() {
+  background(bg);
+  rectMode(CENTER);
+  rect(50, 50, 40, 40);
+}
+
+void keyPressed() {
+  bg = 0;
+}
+
+void mousePressed() {
+  bg = 255;
+}