Expose the details field in the Game model

src/Discord.Net.Core/Entities/Activities/Game.cs

@@ -14,6 +14,8 @@ namespace Discord
         public ActivityType Type { get; internal set; }
         /// <inheritdoc/>
         public ActivityProperties Flags { get; internal set; }
+        /// <inheritdoc/>
+        public string Details { get; internal set; }
 
         internal Game() { }
         /// <summary>
@@ -21,10 +23,12 @@ namespace Discord
         /// </summary>
         /// <param name="name">The name of the game.</param>
         /// <param name="type">The type of activity.</param>
-        public Game(string name, ActivityType type = ActivityType.Playing)
+        public Game(string name, ActivityType type = ActivityType.Playing, ActivityProperties flags = ActivityProperties.None, string details = null)
         {
             Name = name;
             Type = type;
+            Flags = flags;
+            Details = details;
         }
         
         /// <summary> Returns the name of the <see cref="Game"/>. </summary>

src/Discord.Net.Core/Entities/Activities/IActivity.cs

@@ -29,5 +29,12 @@ namespace Discord
         ///     The value of flags for this activity.
         /// </returns>
         ActivityProperties Flags { get; }
+        /// <summary>
+        ///     Gets the details on what the player is currently doing.
+        /// </summary>
+        /// <returns>
+        ///     A string describing what the player is doing.
+        /// </returns>
+        string Details { get; }
     }
 }