Add license

LICENSE

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+Copyright (c) 2019 Cleracruza
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software (including the rights to use,
+copy, modify, merge, publish, distribute the Software) as long as:
+
+* intentions are purely non-commercial, and
+* no reputational damage in caused to Ravensburger or associated
+  brands, and
+* nice things are produced, and
+* the above copyright notice and this permission notice is
+  included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+[The first three items in the above list are in place to be awesome to
+Ravensburger. For details, see (German only):
+https://www.youtube.com/watch?v=GzXtgR73icg&feature=youtu.be&t=50m38s ]