added serialzed dictionary

Packages/SerializedDictionary-main/Runtime/LookupTables/IKeyable.cs

@@ -0,0 +1,19 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace AYellowpaper.SerializedCollections
+{
+    internal interface IKeyable
+    {
+        void RecalculateOccurences();
+        IReadOnlyList<int> GetOccurences(object key);
+        IEnumerable Keys { get; }
+
+        void AddKey(object key);
+        void RemoveKey(object key);
+        void RemoveAt(int index);
+        object GetKeyAt(int index);
+        void RemoveDuplicates();
+    }
+}