pwpolicy: add page (#22419)

Co-authored-by: Ivan Baluta <ivanbaluta.dev@gmail.com>

pages/osx/pwpolicy.md

@@ -0,0 +1,20 @@
+# pwpolicy
+
+> Get and set password policies.
+> More information: <https://keith.github.io/xcode-man-pages/pwpolicy.8.html>.
+
+- Change password for specified user:
+
+`sudo pwpolicy -a {{authenticator}} -u {{username}} -setpassword "{{new_password}}"`
+
+- Disable a user account:
+
+`sudo pwpolicy -u {{username}} -disableuser`
+
+- Enable a user account:
+
+`sudo pwpolicy -u {{username}} -enableuser`
+
+- Get list of password hashes stored on disk for a user account:
+
+`sudo pwpolicy -u {{username}} -gethashtypes`