spctl: add page (#7565)

pages/osx/spctl.md

@@ -0,0 +1,21 @@
+# spctl
+
+> Manage the security assessment policy subsystem.
+> Utility for managing Gatekeeper in macOS.
+> More information: <https://www.unix.com/man-page/osx/8/SPCTL/>.
+
+- Turn off Gatekeeper:
+
+`spctl --master-disable`
+
+- Add a rule to allow an application to run (labeling of rule is optional):
+
+`spctl --add --label "{{rule_name}}" {{path/to/file}}`
+
+- Turn on Gatekeeper:
+
+`spctl --master-enable`
+
+- List all rules on the system:
+
+`spctl --list`