added argument parsing and structure with clap

src/app/args/structure.rs

@@ -0,0 +1,12 @@
+use clap::{Parser, Subcommand};
+
+#[derive(Parser)]
+pub struct Args {
+    #[command(subcommand)]
+    command: Option<CommandArg>
+}
+
+#[derive(Subcommand)]
+enum CommandArg {
+    Build,
+}