add GPLv3 LICENSE file; point README License section at it with Asha Software copyright

@@ -0,0 +1,642 @@1+GNU GENERAL PUBLIC LICENSE2+                       Version 3, 29 June 20073+4+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>5+ Everyone is permitted to copy and distribute verbatim copies of this6+ license document, but changing it is not allowed.7+8+                            Preamble9+10+  The GNU General Public License is a free, copyleft license for11+software and other kinds of works.12+13+  The licenses for most software and other practical works are designed14+to take away your freedom to share and change the works. By contrast,15+the GNU General Public License is intended to guarantee your freedom to16+share and change all versions of a program--to make sure it remains free17+software for all its users. We, the Free Software Foundation, use the18+GNU General Public License for most of our software; it applies also to19+any other work released this way by its authors. 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