Add cli crate skeleton

cli/src/main.rs

@@ -0,0 +1,23 @@
+use anyhow::Result;
+use clap::Parser;
+
+#[derive(Parser)]
+#[command(name = "ubuntu-fidoctl", version, about = "Manage ubuntu-fido configuration")]
+struct Cli {
+    #[command(subcommand)]
+    cmd: Cmd,
+}
+
+#[derive(clap::Subcommand)]
+enum Cmd {
+    Status,
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let args = Cli::parse();
+    match args.cmd {
+        Cmd::Status => println!("ubuntu-fidoctl: not yet implemented"),
+    }
+    Ok(())
+}