Add BSD install notes

Netdisco/lib/App/Netdisco/Manual/BSDInstall.pod

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+=head1 NAME
+
+App::Netdisco::Manual::BSDInstall - BSD Install Instructions
+
+=head1 Introduction
+
+This document is compiled from suggestions and comments on the Netdisco mail
+lists. We're grateful for the help, and if you have any additions please do
+let the project staff know.
+
+=head1 Ports Installs
+
+=over 4
+
+=item *
+
+Perl (if not already installed)
+
+=item *
+
+C<p5-DBD-Pg> (will also pull in C<postgresqlXX-client>)
+
+=item *
+
+C<postgresqlXX-server>
+
+=item *
+
+C<net-snmp> (should install the Perl binding C<SNMP.pm>)
+
+=back
+
+=head1 Additional Steps
+
+=head2 Netdisco User
+
+ pw useradd netdisco -N -m -s /bin/bash -w no
+
+=head2 PostgreSQL Setup
+
+ /usr/local/etc/rc.d/postgresql initdb
+ /usr/local/etc/rc.d/postgresql start
+
+Make sure PostgreSQL starts at boot by adding the following to
+"C</etc/rc.conf>":
+
+ postgresql_enable="YES"
+
+When installing C<postgresqlXX-server> port, it creates the C<pgsql> user with
+"C<nologin>" shell. As root, do C<vipw> and change the shell to C</bin/sh> or
+whichever shell you want, so that you can do the C<createuser> step from the
+main instructions.
+
+C<pgtune> doesn't seem to work on NetBSD. This needs looking into. Nothing
+will break, but it just means the server probably isn't tuned to your system's
+hardware (RAM, etc).
+
+=cut