Added deserialization of PathResult

Pathfinding/PathResult.cs

@@ -1,3 +1,4 @@
+using System.Text.Json;
 using System.Text.Json.Serialization;
 
 namespace Pathfinding;
@@ -17,4 +18,10 @@ public class PathResult
         this.distance = distance;
         this.weight = weight;
     }
+
+    public static PathResult PathresultFromFile(string filePath)
+    {
+        return JsonSerializer.Deserialize<PathResult>(new FileStream(filePath, FileMode.Open, FileAccess.Read,
+            FileShare.Read))!;
+    }
 }