Add a "Wallet" menu

BTCPayServer/Models/WalletViewModels/WalletModel.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc.Rendering;
+
+namespace BTCPayServer.Models.WalletViewModels
+{
+    public class WalletModel
+    {
+        public string ServerUrl { get; set; }
+        public string CryptoCurrency
+        {
+            get;
+            set;
+        }
+    }
+}