Start development infrastructure

[hvwaldow]

Setup dev repo for Rust development. Document for beginners 😄

[JensKrumsieck]

• Rust project was initialized by running cargo init --name s4n 8da035cffc8aa1141c922a32ef49106d71158039
• Added clap crate by cargo add clap --features derive daf7789cca890ebc449e4e5d05b07fbc529f2355
• Build initial command structure in cli.rs 40e969859cfc6d5e9f89b854c049086ec8da1448 Entry point method main is reponsible for parsing the commands, currently only a simple dummy command is implemented which outputs the args it gets. The command structure is defined in cli.rs - business logic does not belong there!

Running cargo run dummy create name -o lol will output:

   Compiling s4n v0.1.0 (/home/ubuntu/m4.4_sciwin_client)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.40s
     Running `target/debug/s4n dummy create name -o lol`
Dummy creation called with CreateDummyArgs { name: "name", option: Some("lol") }