Add some documentation in the cli help output

src/main.rs

@@ -21,9 +21,12 @@ use crate::basic_uart::BasicUart;
 
 mod execload;
 
+/// Taitep's RISC-V Emulator
 #[derive(Parser)]
 struct Args {
+    /// Path to ELF or raw binary executable to load
     executable: PathBuf,
+    /// Make CPU wait for a GDB connection before starting execution
     #[arg(long)]
     wait: bool,
 }