Add examples
modified:   .gitignore
new file:   ch23/item08/AnonymousInnerClassDemo.java
new file:   ch23/item08/InnerClassDemo.java
new file:   ch23/item08/MousePressedDemo.java
new file:   ch24/item04/AppletFrame.java
new file:   ch24/item04/WindowEvents.java
new file:   ch24/item05/AppWindow.java
new file:   ch24/item07/Arcs.java
new file:   ch24/item07/Ellipses.java
new file:   ch24/item07/HourGlass.java
new file:   ch24/item07/Lines.java
new file:   ch24/item07/Rectangles.java
new file:   ch24/item07/ResizeMe.java