added cost to the units

src/main/resources/types.json

@@ -57,6 +57,10 @@
       "controlSignal": 3,
       "health":5,
       "defence":1
+    },
+    "cost": {
+      "metal": 100,
+      "gold": 35
     }
   },
   {
@@ -65,6 +69,10 @@
       "controlSignal":4,
       "health":7,
       "defence":2
+    },
+    "cost": {
+      "metal": 100,
+      "gold": 50
     }
   },
   {
@@ -73,6 +81,10 @@
       "controlSignal":5,
       "movement":1,
       "health":10
+    },
+    "cost": {
+      "metal": 200,
+      "gold": 80
     }
   },
   {
@@ -84,7 +96,11 @@
       "attackRange":3,
       "attackDamage": 2
     },
-    "_actions":["RangeAttackAction"]
+    "_actions":["RangeAttackAction"],
+    "cost": {
+      "metal": 100,
+      "gold": 35
+    }
   },
   {
     "name": "abstract_tower_2",
@@ -92,6 +108,10 @@
     "properties":{
       "health":10,
       "attackDamage": 4
+    },
+    "cost": {
+      "metal": 50,
+      "gold": 30
     }
   },
   {