cli: Show help output when no arguments are specified

cli/src/flags.rs

@@ -118,3 +118,7 @@ impl Skidder {
     }
 }
 // generated end
+
+impl Skidder {
+    pub const HELP: &str = Self::HELP_;
+}

cli/src/main.rs

@@ -22,6 +22,8 @@ fn wrapped_main() -> Result<()> {
         flags::SkidderCmd::Version(flags::Version { version }) => {
             if version {
                 println!("skidder-cli {}", env!("CARGO_PKG_VERSION"));
+            } else {
+                println!("{}", flags::Skidder::HELP);
             }
             Ok(())
         }