docs: add xenstore-read and xenstore-write man pages

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>

docs/man/xenstore-read.pod.1

@@ -0,0 +1,28 @@
+=head1 NAME
+
+xenstore-read - read Xenstore values
+
+=head1 SYNOPSIS
+
+B<xenstore-read> [I<OPTION>]... [I<PATH>]...
+
+=head1 DESCRIPTION
+
+Read values of one or more Xenstore I<PATH>s.
+
+=over
+
+=item B<-p>
+
+Prefix value with key name.
+
+=item B<-s>
+
+Connect to the Xenstore daemon using a local socket only.
+
+=back
+
+=head1 BUGS
+
+Send bugs to xen-devel@lists.xen.org, see
+http://wiki.xen.org/xenwiki/ReportingBugs on how to send bug reports.

docs/man/xenstore-write.pod.1

@@ -0,0 +1,25 @@
+=head1 NAME
+
+xenstore-write - write Xenstore values
+
+=head1 SYNOPSIS
+
+B<xenstore-read> [I<OPTION>]... I<PATH> I<VALUE>...
+
+=head1 DESCRIPTION
+
+Write I<VALUE>s to Xenstore I<PATH>s. Multiple pairs I<PATH> I<VALUE> can be
+provided to write them at once - in one Xenstore transaction.
+
+=over
+
+=item B<-s>
+
+Connect to the Xenstore daemon using a local socket only.
+
+=back
+
+=head1 BUGS
+
+Send bugs to xen-devel@lists.xen.org, see
+http://wiki.xen.org/xenwiki/ReportingBugs on how to send bug reports.