Add Discord GameSDK.

Assets/Plugins/DiscordGameSDK/StoreManager.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Discord
+{
+    public partial class StoreManager
+    {
+        public IEnumerable<Entitlement> GetEntitlements()
+        {
+            var count = CountEntitlements();
+            var entitlements = new List<Entitlement>();
+            for (var i = 0; i < count; i++)
+            {
+                entitlements.Add(GetEntitlementAt(i));
+            }
+            return entitlements;
+        }
+
+        public IEnumerable<Sku> GetSkus()
+        {
+            var count = CountSkus();
+            var skus = new List<Sku>();
+            for (var i = 0; i < count; i++)
+            {
+                skus.Add(GetSkuAt(i));
+            }
+            return skus;
+        }
+    }
+}