added basic xml comments to all Oqtane.Services interfaces

Oqtane.Client/Services/Interfaces/ISystemService.cs

@@ -3,10 +3,22 @@ using System.Threading.Tasks;
 
 namespace Oqtane.Services
 {
+    /// <summary>
+    /// Service to retrieve and update system information.
+    /// </summary>
     public interface ISystemService
     {
+        /// <summary>
+        /// returns a key-value directory with the current system information (os-version, clr-version, etc.)
+        /// </summary>
+        /// <returns></returns>
         Task<Dictionary<string, string>> GetSystemInfoAsync();
 
+        /// <summary>
+        /// Updates system information
+        /// </summary>
+        /// <param name="settings"></param>
+        /// <returns></returns>
         Task UpdateSystemInfoAsync(Dictionary<string, string> settings);
     }
 }