Created Http endpoints for album and artists. Added Album and Artist models. #25, #26, #19, #20

Models/Album.cs

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+using System;
+
+using Newtonsoft.Json;
+
+namespace Icarus.Models
+{
+	public class Album
+	{
+		[JsonProperty("id")]
+		public int Id { get; set; }
+		[JsonProperty("title")]
+		public string Title { get; set; }
+		[JsonProperty("album_artist")]
+		public string AlbumArtist { get; set; }
+		[JsonProperty("song_count")]
+		public int SongCount { get; set; }
+	}
+}

Models/Artist.cs

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+using System;
+
+using Newtonsoft.Json;
+
+namespace Icarus.Models
+{
+	public class Artist
+	{
+		[JsonProperty("id")]
+		public int Id { get; set; }
+		[JsonProperty("name")]
+		public string Name { get; set; }
+		[JsonProperty("song_count")]
+		public int SongCount { get; set; }
+	}
+}