~ruther/verilog-riscv-semestral-project

ref: fb02ebb264bda787ca3441964dfa1fe6e69ca6ef verilog-riscv-semestral-project/src d--------- 
fix: alu arithmetical shift

Has to have signed as arguments

feat(decoder): implement memory mask, conditional jumps

refactor: parametrize register file

chore: move default case

fix: make rd1, rd2 in register_file regs

feat: add instruction decoder

chore: formatting

feat: add basic ram, alu, and register file
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