security: add page (#5033)

pages/osx/security.md

@@ -0,0 +1,16 @@
+# security
+
+> Administer Keychains, keys, certificates and the Security framework.
+> More information: <https://ss64.com/osx/security.html>.
+
+- List the available keychains:
+
+`security list-keychains`
+
+- Delete a specific keychain:
+
+`security delete-keychain {{path}}`
+
+- Create a keychain:
+
+`security create-keychain -p {{password}} {{name.keychain}}`