Implement news api request

osu.Game/Online/API/Requests/GetNewsRequest.cs

@@ -0,0 +1,27 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.IO.Network;
+using osu.Game.Extensions;
+
+namespace osu.Game.Online.API.Requests
+{
+    public class GetNewsRequest : APIRequest<GetNewsResponse>
+    {
+        private readonly Cursor cursor;
+
+        public GetNewsRequest(Cursor cursor = null)
+        {
+            this.cursor = cursor;
+        }
+
+        protected override WebRequest CreateWebRequest()
+        {
+            var req = base.CreateWebRequest();
+            req.AddCursor(cursor);
+            return req;
+        }
+
+        protected override string Target => "news";
+    }
+}

osu.Game/Online/API/Requests/GetNewsResponse.cs

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+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using Newtonsoft.Json;
+using osu.Game.Online.API.Requests.Responses;
+
+namespace osu.Game.Online.API.Requests
+{
+    public class GetNewsResponse : ResponseWithCursor
+    {
+        [JsonProperty("news_posts")]
+        public IEnumerable<APINewsPost> NewsPosts;
+    }
+}