* Add a basic VSCode configuration for probe-rs-debugger
* VSCode: have launch build first and use debug binary
* Got defmt working in vs-code-debugger
* Add VSCode debugger setup to README
In `README.md`, elf2uf2-rs has been misspelled as elf2usb2-rs in installation commands. In `.cargo/config.toml`, a quotation mark need to be added.
For users who use VS Code with Rust Analyzer, setting target architecture could help them to avoid warning like no tests module.