Demo application for Flipper Zero

1. Install rustup by following the instructions on rustup.rs.
2. Install the nightly build tool-chain to support thedifferent-binary-name feature:

   rustup toolchain install nightly
   

3. Install cargo-generate:

   cargo install cargo-generate
   

4. Use rustup to install the thumbv7em-none-eabihf target to the nightly build:

   rustup target add --toolchain nightly thumbv7em-none-eabihf
   

cargo build

The resulting .fap binary can be found in target/thumbv7em-none-eabihf/debug.