feat: start of command line interface

Cargo.toml

@@ -4,4 +4,4 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-
+clap = "4.5.21"

src/main.rs

@@ -1,3 +1,40 @@
+use clap::{Command, Arg};
+
+fn cli() -> Command {
+    Command::new("git-lfs-synology")
+        .about("This is an implementation of a git lfs custom transfer agent. See https://github.com/git-lfs/git-lfs/blob/main/docs/custom-transfers.md for mor information.")
+        .allow_external_subcommands(true)
+        .subcommand(
+            Command::new("login")
+                .about("Allows logging into the Synology NAS.")
+                .args_conflicts_with_subcommands(true)
+                .flatten_help(true)
+                .arg(
+                    Arg::new("USER")
+                        .short('u')
+                        .long("user")
+                        .required(true)
+                        .help("The username for the Synology NAS")
+                )
+                .arg(
+                    Arg::new("URL")
+                        .short('l')
+                        .long("url")
+                        .required(true)
+                        .help("The URL for the Synology NAS")
+                )
+        )
+}
+
 fn main() {
-    println!("Hello, world!");
+    let matches = cli().get_matches();
+
+    match matches.subcommand() {
+        Some(("login", sub_matches)) => {
+            println!("{:?}", sub_matches);
+
+            println!("login")
+        },
+        _ => println!("No subcommand")
+    }
 }