~ruther/verilog-riscv-semestral-project

ref: 181e94c4c368df49b63ee435f623436482f2f6a2 verilog-riscv-semestral-project/testbench d---------
chore: add makefile for both verilog and c
feat: implement sb, sh, lb, lh support via masking
test: add simple cpu test
test: add basic testbenches
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