added basic xml comments to all Oqtane.Services interfaces

Oqtane.Client/Services/Interfaces/ILocalizationService.cs

@@ -4,8 +4,15 @@ using Oqtane.Models;
 
 namespace Oqtane.Services
 {
+    /// <summary>
+    /// Service to retrieve localizations (<see cref="Culture"/>)
+    /// </summary>
     public interface ILocalizationService
     {
+        /// <summary>
+        /// Returns a collection of supported cultures
+        /// </summary>
+        /// <returns></returns>
         Task<IEnumerable<Culture>> GetCulturesAsync();
     }
 }