Add SkinInfo.InstantiationInfo to allow creating different skin types

osu.Game/Migrations/20210511060743_AddSkinInstantiationInfo.cs

@@ -0,0 +1,22 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace osu.Game.Migrations
+{
+    public partial class AddSkinInstantiationInfo : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "InstantiationInfo",
+                table: "SkinInfo",
+                nullable: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "InstantiationInfo",
+                table: "SkinInfo");
+        }
+    }
+}