Docs: add security policy #4524

Job	Run time
path-filter	8s
node-compile (macos-15-intel, default)	1m 53s
node-compile (macos-latest, default)	58s
node-compile (ubuntu-latest, linux/arm64/v8)	7m 39s
node-compile (ubuntu-latest, linux/amd64)	1m 34s
node-compile (windows-latest, amd64)	1m 50s
node-compile (windows-11-arm, arm64)	3m 51s
compile-status-check	3s
release-update	-1s
	17m 55s

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