Add total cost to TaskForce info hint text

Author: JoyfulShush

src/TSMapEditor/Models/TaskForce.cs

@@ -131,6 +131,7 @@ public string GetHintText()
             StringBuilder sb = new StringBuilder();
             sb.Append("Contains:");
 
+            int totalCost = 0;
             foreach (var entry in TechnoTypes)
             {
                 if (entry == null)
@@ -141,8 +142,14 @@ public string GetHintText()
                 sb.Append(entry.Count);
                 sb.Append("x ");
                 sb.Append(entry.TechnoType.GetEditorDisplayName());
+
+                totalCost += entry.TechnoType.Cost * entry.Count;
             }
 
+            sb.Append(Environment.NewLine);
+            sb.Append(Environment.NewLine);
+            sb.Append("Total Cost: $" + totalCost);
+
             return sb.ToString();
         }