Fiscal Printer trait for implement

Allows define a trait using base values for documents send to and from fiscal printer.

For Target Raspberry Pi

SH rustup target add armv7-unknown-linux-gnueabihf

https://medium.com/swlh/compiling-rust-for-raspberry-pi-arm-922b55dbb050

Examples:

rust main.js

rust println!("Hello, world!"); let epale_pnp: example::PnP = FiscalPrinter::new(); epale_pnp.open_port(String::from("Epale")); epale_pnp.send_command(String::from("Ejele")); let setup = Setup::new(String::from("dsadadashdg-ajdhas"), String::from("lpt1")); let result = epale_pnp.setup(setup); println!("Result of Setup {:?}", result); epale_pnp.close_port();