new file:   hdl/code.txt
	samples of code, used : http://www.mipshelper.com/mips-converter.php for code creation.
	modified:   hdl/execute.vhd
	fixed a buck
	modified:   hdl/execute_memory.vhd
	fixed a buck
	modified:   hdl/instruction_memory.vhd
	modified code, be aware of the trap down bellow
	modified:   hdl/registerfile.vhd
	zero register remains zero
	modified:   hdl/top.vhd
	set s_enable to '1', kinda important XD
	modified:   sim/tb_top.do
	added all simulations. comment with "#"