Added 1bit full and half adders
 On branch feature/modules
 Changes to be committed:
	new file:   src/rtl/adder_full.vhd
	new file:   src/rtl/adder_half.vhd
Merge branch 'develop' into feature/modules
Added a 1 bit comparator with eq, lt and gt
 On branch feature/modules
	new file:   rtl/comparator_1bit.vhd