Added summary where needed.

MongoDbGenericRepository/Utils/IdGenerator.cs

@@ -3,10 +3,18 @@ using System;
 
 namespace MongoDbGenericRepository.Utils
 {
+    /// <summary>
+    /// The IdGenerator instance, used to generate Ids of different types.
+    /// </summary>
     public static class IdGenerator
     {
         private static readonly Random Random = new Random();
 
+        /// <summary>
+        /// Generates a random value of a given type.
+        /// </summary>
+        /// <typeparam name="TKey">The type of the value to generate.</typeparam>
+        /// <returns>A value of type TKey.</returns>
         public static TKey GetId<TKey>()
         {
             var idTypeName = typeof(TKey).Name;