- Add MemWr & MemtoReg to Control Signal
- Add the ALU & Barrel Shifter

TODO: Data Path left untouched
      Will be done later

Signed-off-by: Kai-Zhang <j.zhangkai1994@gmail.com>
ALU & Barrel Shifter & MemWr MemtoReg

Signed-off-by: Kai-Zhang <j.zhangkai1994@gmail.com>