Adding flags

src/infos.rs

@@ -55,4 +55,14 @@ impl Difficulty {
         ];
         DIFFICULTIES.iter()
     }
+    pub fn flag_number(&self) -> &str {
+        match self {
+            Difficulty::None => "0",
+            Difficulty::Baby => "1",
+            Difficulty::Easy => "2",
+            Difficulty::Medium => "3",
+            Difficulty::Hard => "4",
+            Difficulty::Nightmare => "5",
+        }
+    }           
 }