0.20210320: added LICENSE

Author: zvezdochiot

LICENSE

@@ -0,0 +1,30 @@
+Public Domain Mark 1.0
+ No Copyright
+
+    This work has been identified as being free of known restrictions
+    under copyright law, including all related and neighboring rights.
+
+    You can copy, modify, distribute and perform the work, even for
+    commercial purposes, all without asking permission. See Other
+    Information below.
+
+ Other Information
+
+    The work may not be free of known copyright restrictions in all
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+
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+    In some jurisdictions moral rights of the author may persist beyond
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