Add manpages for all commands

Signed-off-by: Stephen Kitt <steve@sk2.org>

software/tools/passgen.1

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+.\"                                      Hey, EMACS: -*- nroff -*-
+.TH PASSGEN 1 "June 25 2018"
+.\" Please adjust this date whenever revising the manpage.
+.SH NAME
+passgen \- generates passwords by rolling dice
+.SH SYNOPSIS
+.B passgen
+.RI < file >
+.RI < size >
+.SH DESCRIPTION
+.B passgen
+generates an alphabetic password by rolling a 26-sided die, fed from
+.IR file ,
+.I size
+times.
+.SH OPTIONS
+This program has no options.
+.SH SEE ALSO
+.BR infnoise (8).