[assembly.riscv][simulation] Add QtRVSim Simulator

[MattPD]

Thanks!

Nit: Please re-format to follow the existing style: Alphabetical order (QtRVSim goes between MARSS-RISCV and RARS), use original title from the GitHub repository ("QtRVSim: RISC-V CPU Simulator for Education Purposes"), include bibliographic information for papers/talks (with an extra level of indentation--under the software itself), make sure to use canonical URLs (avoid shorteners like "youtu.be"); as in:

- QtRVSim: RISC-V CPU Simulator for Education Purposes
    - https://github.com/cvut/qtrvsim
    - https://comparch.edu.cvut.cz/qtrvsim/app/
    - QtRVSim – RISC-V Simulator for Computer Architectures Classes
        - DevConf.cz Mini 2022; Jakub Dupak
        - https://www.youtube.com/watch?v=l0jfvINWgK4

[MattPD]

Closed: Done in e60b2db.