Add LICENSE to levels

assets/LICENSE

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+CosmoNotes, CosmoPoly, LOMA, MicroCosmos, MiniCosmos, NaboCosmos and PicoCosmos level sets
+Copyright (C) by Aymeric du Peloux.
+E-mail: [email protected]
+
+
+dh1, dh2, bagatelle, cantrip, and maelstrom level sets
+Copyright (C) by David Holland
+
+
+Microban, Mas Microban, Sasquatch, Mas Sasquatch, Sasquatch III, Sasquatch IV, Sasquatch V, Sasquatch VI and Sasquatch VII level sets.
+Copyright (C) by David W. Skinner
+E-mail: [email protected]
+
+
+Grigr2001, Grigr2002 and GrigrSpecial level sets
+Copyright (C) by Evgeny Grigoriev (aka GRIGoRusha)
+E-mail: [email protected]
+Website: http://grigr.narod.ru/
+
+
+SokEvo and SokHard level sets
+Copyright (C) 2002-2006 by Lee J Haywood
+E-mail: [email protected]
+Website: http://leehaywood.org/games/sokoban/
+
+
+Sven level set
+Copyright (C) 2007 by Sven Egevad
+E-mail: [email protected]
+
+
+Box world, Sokoban Perfect and Sokoban Revenge level sets
+Copyright (C) 1989, 1991 by Thinking Rabbit
+Website: https://sokoban.jp/
+
+
+Y.M. Auto and Y.M. Handmade level sets
+Copyright (C) Yoshio Murase 
+E-mail: [email protected]
+Website: http://www.ne.jp/asahi/ai/yoshio/sokoban/index.html