Add XMLDocs

+ GameAsset
+ GameTimestamps
+ Format

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

@@ -1,14 +1,18 @@
 namespace Discord
 {
+    /// <summary> The asset for a <see cref="RichGame"/> object. </summary>
     public class GameAsset
     {
         internal GameAsset() { }
 
         internal ulong? ApplicationId { get; set; }
-        
+
+        /// <summary> The description of the asset. </summary>
         public string Text { get; internal set; }
+        /// <summary> The image ID of the asset. </summary>
         public string ImageId { get; internal set; }
-        
+
+        /// <summary> The image URL of the asset; may return null when the application ID does not exist.</summary>
         public string GetImageUrl(ImageFormat format = ImageFormat.Auto, ushort size = 128)
             => ApplicationId.HasValue ? CDN.GetRichAssetUrl(ApplicationId.Value, ImageId, size, format) : null;
     }

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

@@ -1,7 +1,8 @@
-using System;
+using System;
 
 namespace Discord
 {
+    /// <summary> The timestamps for a <see cref="RichGame"/> object. </summary>
     public class GameTimestamps
     {
         public DateTimeOffset? Start { get; }
@@ -13,4 +14,4 @@ namespace Discord
             End = end;
         }
     }
-}
+}

src/Discord.Net.Core/Format.cs

@@ -1,5 +1,6 @@
-namespace Discord
+namespace Discord
 {
+    /// <summary> A helper class for formatting characters. </summary>
     public static class Format
     {
         // Characters which need escaping