Add CC-BY-SA 4.0 license. See #82.

KonradHoeffner · KonradHoeffner · commit 4d2761df6103 · 2021-11-18T14:27:07.000+01:00
diff --git a/LICENSE b/LICENSE
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+This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+

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	`1`	`+This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.`
	`2`	`+`