Add a security policy #120

Job	Run time
lint	36s
package-sdist	7s
package-wheel (manylinux, ubuntu-latest)	20m 28s
test (ubuntu-latest, 3.7)	3m 54s
package-wheel (macos, macos-latest)	3m 8s
test (ubuntu-latest, 3.8)	3m 40s
package-wheel (win, windows-latest)	5m 10s
test (ubuntu-latest, 3.9)	3m 50s
test (ubuntu-latest, 3.10)	1m 56s
test (ubuntu-latest, 3.11)	3m 27s
test (ubuntu-latest, 3.12)	3m 50s
test (macos-latest, 3.7)	15m 28s
test (macos-latest, 3.8)	16m 8s
test (macos-latest, 3.9)	9m 9s
test (macos-latest, 3.10)	11m 11s
test (macos-latest, 3.11)	11m 59s
test (macos-latest, 3.12)	7m 47s
test (windows-latest, 3.7)	10m 39s
test (windows-latest, 3.8)	11m 14s
test (windows-latest, 3.9)	11m 5s
test (windows-latest, 3.10)	11m 51s
test (windows-latest, 3.11)	10m 53s
test (windows-latest, 3.12)	10m 41s
publish	0s
	3h 8m 11s

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