added readme and license

[img2tiles] / README.md

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+img2tiles
+=========
+
+Carves up an image file into NxM tiles, and writes the result as an image, as a
+GNU assembler data declaration, or C array. It also outputs the acompanying
+tilemap for reconstructing the original image out of the tiles.
+
+License
+-------
+Copyright (C) 2019 John Tsiombikas <nuclear@member.fsf.org>
+
+This program is free software. Feel free to use, modify, and/or redistribute it,
+under the terms of the GNU General Public License v3, or at your option any
+later version published by the Free Software Foundation. See COPYING for
+details.