added add4 and de1_add4 with sim and syn
pnr/de1_add4/makefile
0 → 100644
sim/add4/makefile
0 → 100644
sim/add4/makefile.sources
0 → 100644
sim/de1_add4/makefile
0 → 100644
src/add4_rtl.vhd
0 → 100644
src/de1_add4_rtl.vhd
0 → 100644
src/t_add4.vhd
0 → 100644
src/t_de1_add4.vhd
0 → 100644
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