Addition of a Readme file at the top level directory.

Readme.txt

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+Copyright 2013 Google Inc.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+MA  02110-1301, USA.
+
+
+=====================================
+ Summary
+=====================================
+
+Circuit diagram and firmware of physical input devices
+for Google Japanese Input.
+
+This document describes the directory structure of the project.
+
+
+=====================================
+ Files
+=====================================
+
+* USB Morse Key for Google Japanese Input (2012)
+./mozc-morse/
+
+* Split-flap display input device for Google Japanese Input (2013)
+./mozc-flap/
+
+* V-USB library files
+./third_party/usbdrv/
+
+The directory and files were copied from V-USB files available at
+http://www.obdev.at/vusb/
+
+
+=====================================
+ Build instructions
+=====================================
+
+See Readme.txt in each directory.
+
+
+==================
+ References
+==================
+
+The firmwares and circuit diagrams have been developed based on V-USB.
+
+* V-USB
+http://www.obdev.at/vusb/