Add more monsters at varying levels with different damange and hp

resources/template.ron

@@ -28,9 +28,10 @@ Templates(
             entity_type: Enemy,
             name: "Goblin",
             glyph: 'g',
-            levels: [0, 1, 2],
+            levels: [0],
             hp: Some(1),
             frequency: 3,
+            base_damage: Some(1),
         ),
         Template(
             entity_type: Enemy,
@@ -39,6 +40,25 @@ Templates(
             levels: [0, 1, 2],
             hp: Some(2),
             frequency: 2,
+            base_damage: Some(1),
+        ),
+        Template(
+            entity_type: Enemy,
+            name: "Ogre",
+            glyph: 'O',
+            levels: [1, 2],
+            hp: Some(5),
+            frequency: 1,
+            base_damage: Some(2),
+        ),
+        Template(
+            entity_type: Enemy,
+            name: "Ettin",
+            glyph: 'E',
+            levels: [2],
+            hp: Some(10),
+            frequency: 1,
+            base_damage: Some(3),
         ),
     ]
 )