docs: Add man pages

This patch adds man pages for chasquid's main commands and
configuration. They are generated using pod2man (commonly used for this,
and included with perl in most distributions).

The generated man pages are included to avoid introducing a dependency
for such simple task, similar to how we handle protocol buffer generated
files.

docs/man/chasquid-util.1.pod

@@ -0,0 +1,61 @@
+=head1 NAME
+
+chasquid-util - chasquid management tool
+
+
+=head1 SYNOPSIS
+
+B<chasquid-util> [I<options>] user-add I<user@domain> [--password=I<password>]
+
+B<chasquid-util> [I<options>] user-remove I<user@domain>
+
+B<chasquid-util> [I<options>] authenticate I<user@domain> [--password=I<password>]
+
+B<chasquid-util> [I<options>] check-userdb I<domain>
+
+B<chasquid-util> [I<options>] aliases-resolve I<addr>
+
+B<chasquid-util> [I<options>] print-config
+
+
+=head1 DESCRIPTION
+
+chasquid-util is a command-line utility for chasquid(1) operations.
+
+=head1 OPTIONS
+
+=over 8
+
+=item B<user-add> I<user@domain> [--password=I<password>]
+
+Add a new user to the domain.
+
+=item B<user-remove> I<user@domain>
+
+Remove the user from the domain.
+
+=item B<authenticate> I<user@domain> [--password=I<password>]
+
+Check the user's password.
+
+=item B<check-userdb> I<domain>
+
+Check the integrity of the domain's users database.
+
+=item B<aliases-resolve> I<addr>
+
+Resolve the given address.
+
+=item B<print-config>
+
+Parse and print the configuration in a human-readable way.
+
+=item B<-C> or B<--configdir=<path>>
+
+Configuration directory.
+
+=back
+
+=head1 SEE ALSO
+
+chasquid(1)