add the documentation for first

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@312 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/program/doc/rrdfirst.pod b/program/doc/rrdfirst.pod
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+=head1 NAME
+
+rrdfirst - Return the date of the first data sample in an B<RRA> within an B<RRD>
+
+=for html <div align="right"><a href="rrdfirst.pdf">PDF</a> version.</div>
+
+=head1 SYNOPSIS
+
+B<rrdtool> B<first> I<filename> [I<--rraindex number>]
+
+=head1 DESCRIPTION
+
+The B<first> function returns the UNIX timestamp of the first data sample for
+the specified RRA of the RRD file.
+
+=over 8
+
+=item I<filename>
+
+The name of the B<RRD> that contains the data.
+
+=item I<--rraindex number>
+
+The index number of the B<RRA> that is to be examined.  If not specified, the
+index defaults to zero. B<RRA> index numbers can be determined through 
+B<rrdtool info>.
+
+=back
+
+=head1 AUTHOR
+
+Burton Strauss <Burton@ntopSupport.com>
+
+