Added GetNode(Coordinates coordinates)

Added GetNode(ulong id)
Instead of returning null in LoadRegion now throw an exception when file is not found.
Added some Method descriptors

OSMDatastructure/Region.cs

@@ -2,7 +2,7 @@ namespace OSMDatastructure
 {
     public class Region
     {
-        public const float regionSize = 0.01f;
+        public const float regionSize = 0.01f; //For Splitting
         private readonly Dictionary<ulong, Node> _nodesInRegion = new();
         public ulong regionHash { get; }
     
@@ -36,6 +36,16 @@ namespace OSMDatastructure
         {
             return this._nodesInRegion.ContainsKey(id) ? this._nodesInRegion[id] : null;
         }
-        
+
+        public Node? GetNode(Coordinates coordinates)
+        {
+            foreach (Node node in this._nodesInRegion.Values)
+            {
+                if (node.Equals(coordinates))
+                    return node;
+            }
+
+            return null;
+        }
     }
 }