added DatabaseService to get list of database types from server

Oqtane.Client/Services/DatabaseService.cs

@@ -0,0 +1,28 @@
+using Oqtane.Models;
+using System.Threading.Tasks;
+using System.Net.Http;
+using System.Linq;
+using System.Collections.Generic;
+using Oqtane.Shared;
+
+namespace Oqtane.Services
+{
+    public class DatabaseService : ServiceBase, IDatabaseService
+    {
+
+        private readonly SiteState _siteState;
+
+        public DatabaseService(HttpClient http, SiteState siteState) : base(http)
+        {
+            _siteState = siteState;
+        }
+
+        private string Apiurl => CreateApiUrl("Database", _siteState.Alias);
+
+        public async Task<List<Database>> GetDatabasesAsync()
+        {
+            List<Database> databases = await GetJsonAsync<List<Database>>(Apiurl);
+            return databases.OrderBy(item => item.FriendlyName).ToList();
+        }
+    }
+}

Oqtane.Client/Services/Interfaces/IDatabaseService.cs

@@ -0,0 +1,11 @@
+using Oqtane.Models;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Oqtane.Services
+{
+    public interface IDatabaseService
+    {
+        Task<List<Database>> GetDatabasesAsync();
+    }
+}