R55 implementation

[0xurb]

Resolves #81

Needs to be tested with RISC-V bytecode, which can be taken from https://github.com/leonardoalt/r55/blob/587a4850e293dea4c5ebf5710cf73618eba1509f/r55/src/main.rs#L183

Note: Maybe add one more 0xFF to make it 2-bytes prefix for RISC-V bytecode, to avoid odd num of digits on bytecode.
So bytecode will be

0xFF + 0xFF + $COMPILED_RISC_V_BYTECODE