best document for install is own Rust documention
for linux users download and run rust bash file
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
then just add this line to your shell. for bash:
echo 'source $HOME/.cargo/env' >> ~/.bashrc
just use it!
cargo run
Welcome to Convertor App,
at first input which type of convert do you need
1 for convert from Fahrenheit to Celsius
2 for convert from Celsius to Fahrenheit
3 for exit
Enter convertor type: