Quarinees/MCUpicorv32 — reverse-engineered prompt

Build me a small FPGA microcontroller project using the PicoRV32 core. I want it set up like a real repo, with source code, simple firmware, a simulation area, and implementation files so I can try it on an FPGA toolchain later.

Since there isn't a README to follow, make reasonable choices and keep everything easy to understand. The first demo should be very simple, like firmware that proves the CPU is running and a simulation that shows memory and basic I/O working.

Please include clear build or run instructions, comments where the hardware pieces connect, and a short explanation of what each folder is for. If something depends on a specific FPGA tool, leave sensible placeholders and explain what I need to install. Look up current docs online if you need to.