Added basic man page.

checkpw.1

@@ -0,0 +1,24 @@
+.TH man 1 "01 Jan 2025" "checkpw 1.1.0" "checkpw man page"
+.SH NAME
+checkpw \- checks the validity of a users password on a UNIX/PAM-based system.
+.SH SYNOPSIS
+checkpw [OPTION]...
+.SH DESCRIPTION
+checkpw is a program that checks the validity of a users password on a UNIX/PAM-based system.
+.SH OPTIONS
+The options which apply to the checkpw command are:
+
+  -u <username>  Set username.
+  -p <password>  Set password.
+  -v             Enable verbose mode.
+  -V             Print program version.
+  -h             Show this help.
+
+checkpw runs in an interactive mode when no username and/or password are set. A missing username and/or password will then be asked for program execution.
+
+.SH SEE ALSO
+pam(3), pam_authenticate(3), PAM(8)
+.SH BUGS
+No known bugs.
+.SH AUTHOR
+Johannes Findeisen (you@hanez.org)