docs(man): add manpage template

man/pacdef.8

@@ -0,0 +1,22 @@
+.TH "PACDEF" "8" "2023\-05\-26" "pacdef v1\&.2\&.1" "Pacdef Manual"
+
+.SH "NAME"
+pacdef — multi-backend declarative package manager
+.SH SYNOPSIS
+.sp
+\fIpacdef\fR group <subcommand>
+.sp
+\fIpacdef\fR package <subcommand>
+.sp
+\fIpacdef\fR version
+.SH DESCRIPTION
+Pacdef ...
+
+.SH CONFIGURATION
+.SH SUBCOMMANDS
+.SH EXIT STATUS
+.SH FILES
+.SH BUGS
+.SH AUTHORS
+.SH SEE ALSO
+