Add prospective manual page for spawntab

spawntab.5

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+.Dd August 13, 2020
+.Dt SPAWNTAB 5
+.Os
+.
+.Sh NAME
+.Nm spawntab
+.Nd spawnd services list
+.
+.Sh DESCRIPTION
+The
+.Nm
+file lists the services managed by the
+.Xr spawnd 8
+daemon.
+Leading whitespace is ignored.
+Each line of the file
+is one of the following:
+.
+.Bl -tag -width Ds
+.It Cm # Ar comment ...
+Lines beinning with
+.Ql #
+and blank lines are ignored.
+.
+.It Cm % Ar command ...
+Lines beginning with
+.Ql %
+add shell commands
+to be executed before
+each of the service commands.
+These commands are executed
+in the order they appear in the file,
+for all services.
+These lines can be used to
+set shell or environment variables
+to be expanded in service command lines
+or used by the service processes.
+.
+.It Ar service Ar command ...
+All other lines define services.
+The service name is separated
+from its command line by whitespace.
+The rest of the line after the service name
+is executed using the shell.
+The shell variable
+.Va $0
+is set to the name of the service.
+.El
+.
+.Sh EXAMPLES
+.Bd -literal
+# Basic services:
+calico	calico -H irc.example.org /var/run/calico
+pounce/freenode	pounce /usr/local/etc/pounce/freenode.conf
+pounce/tilde	pounce /usr/local/etc/pounce/tilde.conf
+
+# Setting environment variables:
+% export PATH=$PATH:/usr/local/bin
+
+# Using variables to expand service command lines:
+% pounce=/usr/local/bin/pounce
+% conf=/usr/local/etc/pounce
+pounce/freenode	$pounce $conf/freenode.conf
+pounce/tilde	$pounce $conf/tilde.conf
+.El
+.
+.Sh SEE ALSO
+.Xr spawnd 8
+.
+.Sh AUTHORS
+.An June Bug Aq Mt june@causal.agency