examples/bitwise.av

## examples/bitwise.av
let OPEN = 0x01;

let flag = 0;

flag = flag | OPEN;

(flag  & OPEN) == OPEN ? println("open") : println("close");

flag = flag &~ OPEN;

(flag  & OPEN) == OPEN ? println("open") : println("close");

println("flag is " + flag);