Add project files.

Assets/Cryville/Crtr/Browsing/ResourceConverter.cs

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+using System.Collections.Generic;
+using System.IO;
+namespace Cryville.Crtr.Browsing {
+	public abstract class ResourceConverter {
+		public abstract string[] GetSupportedFormats();
+		public abstract IEnumerable<Resource> ConvertFrom(FileInfo file);
+	}
+	public abstract class Resource {
+		protected Resource(string name) {
+			Name = name;
+		}
+		public string Name { get; private set; }
+	}
+	public class ChartResource : Resource {
+		public ChartResource(string name, Chart main, ChartMeta meta) : base(name) {
+			Main = main; Meta = meta;
+		}
+		public Chart Main { get; private set; }
+		public ChartMeta Meta { get; private set; }
+	}
+	public class CoverResource : Resource {
+		public CoverResource(string name, FileInfo src) : base(name) {
+			Source = src;
+		}
+		public FileInfo Source { get; private set; }
+	}
+	public class SongResource : Resource {
+		public SongResource(string name, FileInfo src) : base(name) {
+			Source = src;
+		}
+		public FileInfo Source { get; private set; }
+	}
+}