Lightning Network support implementation

BTCPayServer/Models/StoreViewModels/LightningNodeViewModel.cs

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+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.StoreViewModels
+{
+    public class LightningNodeViewModel
+    {
+        class Format
+        {
+            public string Name { get; set; }
+            public string Value { get; set; }
+        }
+        [Display(Name = "Lightning charge url")]
+        public string Url
+        {
+            get;
+            set;
+        }
+
+        [Display(Name = "Crypto currency")]
+        public string CryptoCurrency
+        {
+            get;
+            set;
+        }
+        public SelectList CryptoCurrencies { get; set; }
+        public string StatusMessage { get; set; }
+
+        public void SetCryptoCurrencies(BTCPayNetworkProvider networkProvider, string selectedScheme)
+        {
+            var choices = networkProvider.GetAll()
+                            .Where(n => n.CLightningNetworkName != null)
+                            .Select(o => new Format() { Name = o.CryptoCode, Value = o.CryptoCode }).ToArray();
+            var chosen = choices.FirstOrDefault(f => f.Name == selectedScheme) ?? choices.FirstOrDefault();
+            CryptoCurrencies = new SelectList(choices, nameof(chosen.Value), nameof(chosen.Name), chosen);
+            CryptoCurrency = chosen.Name;
+        }
+    }
+}