Add project files.

Assets/Cryville/Common/IOExtensions.cs

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+using System;
+using System.IO;
+using System.Text;
+
+namespace Cryville.Common {
+	public static class IOExtensions {
+		public static DirectoryInfo GetSubdirectory(this DirectoryInfo dir, string name) {
+			var l1 = dir.GetDirectories(name);
+			if (l1.Length == 0) return dir.CreateSubdirectory(name);
+			else return l1[0];
+		}
+		
+		public static string ReadUInt16String(this BinaryReader reader, Encoding encoding = null) {
+			if (encoding == null) encoding = Encoding.UTF8;
+			var len = reader.ReadUInt16();
+			byte[] buffer = reader.ReadBytes(len);
+			return encoding.GetString(buffer);
+		}
+		
+		public static void WriteUInt16String(this BinaryWriter writer, string value, Encoding encoding = null) {
+			if (encoding == null) encoding = Encoding.UTF8;
+			byte[] buffer = encoding.GetBytes(value);
+			writer.Write((ushort)buffer.Length);
+			writer.Write(buffer);
+		}
+	}
+}