Configure building Rust project for Raspberry Pi

[taesungh]

Resolves #1.

Changes

• Add Cargo config to set build target platform and linker
• Include setup instructions in README

Testing

1. Build the project with the ARM target from your personal machine
2. Attempt to run the executable on the Raspberry Pi in lab
3. Observe the program behaves as expected

Remaining tasks

• Include compiler installation instructions for macOS
• Include compiler installation instructions for Windows
• Include alternative instructions for using cross
• Update checks workflow to support cross-compilation

[taesungh]

Following from #15, we'll also need to update the checks workflow to be able to compile for arm-linux.

[SM-dot]

Thanks for setting this up!

• Is there a certain minimum required versions of Rust, cargo-watch, and Docker required?

• While the cross-compilation section is thorough for Windows/Linux, the instructions for MacOS appear relatively brief. Would it be possible to provide additional details or addressing specific MacOS nuances to maintain consistency and completeness across all platforms?

[taesungh]

We specify Rust edition 2021 in Cargo.toml. We would expect developers to use modern versions of cargo and rustc although older versions should also work. The Docker setup instructions actually apply to all host operating systems, and Sam will be providing a separate section for native compilation on Windows. There aren't many nuances with using the ARM compiler on macOS although we may need a separate script to distinguish host OS (pending discussion with Sam).

[samderanova]

Looks good, one small issue.

[samderanova]

Thanks for working on this! Please squash merge.