ENH: Add license badge to README #368

Job	Run time
build	42s
test (ubuntu-latest, 3.8, x64, .)	5m 21s
test (ubuntu-latest, 3.8, x64, dist/*.whl)	5m 11s
test (ubuntu-latest, 3.8, x64, dist/*.tar.gz)	5m 13s
test (ubuntu-latest, 3.9, x64, .)	4m 53s
test (ubuntu-latest, 3.9, x64, dist/*.whl)	4m 42s
test (ubuntu-latest, 3.9, x64, dist/*.tar.gz)	5m 3s
test (ubuntu-latest, 3.10, x64, .)	4m 50s
test (ubuntu-latest, 3.10, x64, dist/*.whl)	4m 54s
test (ubuntu-latest, 3.10, x64, dist/*.tar.gz)	5m 6s
test (ubuntu-latest, 3.11, x64, .)	4m 39s
test (ubuntu-latest, 3.11, x64, dist/*.whl)	4m 34s
test (ubuntu-latest, 3.11, x64, dist/*.tar.gz)	4m 36s
test (ubuntu-latest, 3.12, x64, .)	5m 44s
test (ubuntu-latest, 3.12, x64, dist/*.whl)	5m 44s
test (ubuntu-latest, 3.12, x64, dist/*.tar.gz)	5m 29s
deploy	0s
	1h 16m 41s

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