Add flag in order to generate a random world

src/main.rs

@@ -239,6 +239,12 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 .takes_value(true)
                 .help("Configuration file"),
         )
+        .arg(
+            Arg::with_name("random-world")
+                .long("random-world")
+                .takes_value(false)
+                .help("Generate random world"),
+        )
         .get_matches();
 
     let raw_conf = open_file(matches.value_of("file").unwrap_or("two_robots.txt"))?;