add somme comments

src/main.rs

@@ -141,8 +141,11 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         )
         .get_matches();
 
-    let mut robot_pool: Vec<Robot> = Vec::new();
     let raw_conf = open_file(matches.value_of("file").unwrap_or("two_robots.txt"))?;
+
+    // We store all the robots inside a pool O_o
+    let mut robot_pool: Vec<Robot> = Vec::new();
+
     Ok(())
 }