Add NOTICE file with copyright and license information #19

Job	Run time
E2E Tests (gts-spec)	42s
Security (pip-audit on Ubuntu)	16s
Code Coverage (pytest-cov)	21s
Test Suite (windows-latest, python=3.11)	1m 14s
Test Suite (macos-latest, python=3.11)	28s
Test Suite (ubuntu-latest, python=3.11)	29s
	3m 30s

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