add example payload for client_status

src/Discord.Net.Rest/API/Common/Presence.cs

@@ -19,6 +19,11 @@ namespace Discord.API
         public Optional<ulong[]> Roles { get; set; }
         [JsonProperty("nick")]
         public Optional<string> Nick { get; set; }
+        // This property is a Dictionary where each key is the ClientType
+        // and the values are the current client status.
+        // The client status values are all the same.
+        // Example:
+        //   "client_status": { "desktop": "dnd", "mobile": "dnd" }
         [JsonProperty("client_status")]
         public Optional<Dictionary<string, string>> ClientStatus { get; set; }
     }