Implemented a blank Btc command

side-node/src/cli/mod.rs

@@ -17,6 +17,9 @@ pub(crate) struct Args {
 
 #[derive(Subcommand)]
 pub(crate) enum Commands {
+    /// Placeholder for future BTC commands
+    Btc {},
+
     /// runs the Side Node
     Run { name: String },