pwqgen: add page (#16978)

Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>

pages/common/pwqgen.md

@@ -0,0 +1,25 @@
+# pwqgen
+
+> Generate a random passphrase.
+> See also: `libpasswdqc`.
+> More information: <https://manned.org/pwqgen>.
+
+- Generate a passphrase:
+
+`pwqgen`
+
+- Generate a passphrase with a specific bit size between 24 and 136:
+
+`pwqgen random={{bitsize}}`
+
+- Use a config file to control password generation:
+
+`pwqgen config={{path/to/config_file}}`
+
+- Display help:
+
+`pwqgen {{[-h|--help]}}`
+
+- Display version:
+
+`pwqgen --version`