implemented sub_command and list option

src/bin/kakei.rs

@@ -0,0 +1,33 @@
+use clap::Parser;
+
+fn main() {
+    let args: Args = Args::parse();
+    let is_listed: bool = args.list;
+
+    match args.sub_command.as_str() {
+        "set-income" => {
+            println!("set-income is running...")
+        }
+        "get-balance" => {
+            println!("{}", is_listed);
+            println!("get-balance is running...")
+        }
+        "set-expense" => {
+            println!("set-expense is running...");
+        }
+        _ => {
+            eprintln!("Unknown command: {}", &args.sub_command);
+        }
+    }
+
+}
+
+#[derive(Debug, Parser)]
+#[command(author, version, about)]
+pub struct Args {
+    #[arg(help = "What you want to do")]
+    pub sub_command: String,
+
+    #[arg(long, help = "If you want kakei to show as list, use --list")]
+    pub list: bool,
+}