added serialzed dictionary

Packages/SerializedDictionary-main/Samples~/Usage/SerializedDictionarySampleTwo.cs

@@ -0,0 +1,19 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace AYellowpaper.SerializedCollections
+{
+    public class SerializedDictionarySampleTwo : MonoBehaviour
+    {
+        [SerializedDictionary("ID", "Person")]
+        public SerializedDictionary<int, Person> People;
+
+        [System.Serializable]
+        public class Person
+        {
+            public string FirstName;
+            public string LastName;
+        }
+    }
+}