Add examples
new file:   ch05/ch05x01/IfElse.java
new file:   ch05/ch05x02/MissingBreak.java
new file:   ch05/ch05x02/SampleSwitch.java
new file:   ch05/ch05x02/StringSwitch.java
new file:   ch05/ch05x02/Switch.java
new file:   ch05/ch05x03/NoBody.java
new file:   ch05/ch05x03/While.java
new file:   ch05/ch05x04/DoWhile.java
new file:   ch05/ch05x04/Menu.java
new file:   ch05/ch05x05/Comma.java
new file:   ch05/ch05x05/FindPrime.java
new file:   ch05/ch05x05/ForTick.java
new file:   ch05/ch05x05/ForVar.java
new file:   ch05/ch05x05/Sample.java