Add a basic Hacking.md for getting started, building, running, etc.

Hacking.md

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+This project is written in rust. For any unfamiliar with how that works the following should help:
+
+To build you'll want a rust implementation for your laptop/device you are testing on.
+
+https://wiki.archlinux.org/title/rust has some good guidelines for getting that sorted. but mostly boils down
+to install rustup from the rustup package (if you're on arch) and use:
+
+rustup default stable
+
+to get an initial toolchain, etc.
+
+Once you have that and cargo is in your path, to build and run this project use the following:
+
+To build:
+
+cargo build
+
+To run:
+
+cargo run
+
+As far as IDEs go I find Visual Studio Code works pretty well for giving errors about things you
+are changing and has plugins for vim mode, etc. if you are used to those keybindings. Most/all
+IDEs that work with language servers should do that fine though.
+
+For VS Code I use these extensions to help: rust and rust-analyzer