adding a COPYING.md with info about arphic fonts and makemeahanzi

Author: David Chanin

COPYING.md

@@ -0,0 +1,11 @@
+Hanzi Writer uses data from the excellent [Make Me a Hanzi](https://github.com/skishore/makemeahanzi) project and fonts from [Arphic](http://www.arphic.com.tw/en/home/index). You can redistribute and/or modify the font data under the terms of the Arphic Public License as published by Arphic Technology Co., Ltd. You should have
+received a copy of this license (the directory "APL") in the data folder of this repository;
+if not, see <http://ftp.gnu.org/non-gnu/chinese-fonts-truetype/LICENSE>.
+
+Arphic PL KaitiM GB and UKai
+Copyright 1999 Arphic Technology Co., Ltd.; licensed under the Arphic Public License
+http://www.arphic.com.tw/en/home/index
+
+Make Me a Hanzi
+Copyright 1999 Arphic Technology Co., Ltd., copyright 2016 Shaunak Kishore; licensed under the Arphic Public License
+https://github.com/skishore/makemeahanzi