[args] Accept the rom filename as arg

src/args.rs

@@ -2,7 +2,7 @@ use clap::Parser;
 
 #[derive(Parser,Debug,Clone)]
 #[command(version,about,author)]
-pub struct Chip8ProgramArgs{
+pub struct Porcel8ProgramArgs {
     #[arg(short,long,help = "Filename of ROM to load.")]
     pub filename:Option<String>
 }