added basic xml comments to all Oqtane.Services interfaces

Oqtane.Client/Services/Interfaces/ILanguageService.cs

@@ -4,14 +4,38 @@ using System.Threading.Tasks;
 
 namespace Oqtane.Services
 {
+
+    /// <summary>
+    /// Service to manage <see cref="Language"/> entries
+    /// </summary>
     public interface ILanguageService
     {
+        /// <summary>
+        /// Returns a list of all available languages for the given <see cref="Site"/> 
+        /// </summary>
+        /// <param name="siteId"></param>
+        /// <returns></returns>
         Task<List<Language>> GetLanguagesAsync(int siteId);
 
+        /// <summary>
+        /// Returns the given language
+        /// </summary>
+        /// <param name="languageId"></param>
+        /// <returns></returns>
         Task<Language> GetLanguageAsync(int languageId);
 
+        /// <summary>
+        /// Adds the given language
+        /// </summary>
+        /// <param name="language"></param>
+        /// <returns></returns>
         Task<Language> AddLanguageAsync(Language language);
 
+        /// <summary>
+        /// Deletes the given language
+        /// </summary>
+        /// <param name="languageId"></param>
+        /// <returns></returns>
         Task DeleteLanguageAsync(int languageId);
     }
 }