Add GetScoresRequest API methods.

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

@@ -0,0 +1,37 @@
+using System.Collections.Generic;
+using Newtonsoft.Json;
+using osu.Framework.IO.Network;
+using osu.Game.Database;
+using osu.Game.Modes;
+
+namespace osu.Game.Online.API.Requests
+{
+    public class GetScoresRequest : APIRequest<GetScoresResponse>
+    {
+        private readonly BeatmapInfo beatmap;
+
+        public GetScoresRequest(BeatmapInfo beatmap)
+        {
+            this.beatmap = beatmap;
+        }
+
+        protected override WebRequest CreateWebRequest()
+        {
+            var req = base.CreateWebRequest();
+            req.AddParameter(@"c", beatmap.Hash);
+            req.AddParameter(@"f", beatmap.Path);
+            return req;
+        }
+
+        protected override string Target => @"beatmaps/scores";
+    }
+
+    public class GetScoresResponse
+    {
+        [JsonProperty(@"beatmap")]
+        public BeatmapInfo Beatmap;
+
+        [JsonProperty(@"scores")]
+        public IEnumerable<Score> Scores;
+    }
+}