Added cta man page

cmdline/cta.1cta

+.\" The CERN Tape Archive (CTA) project
+.\" Copyright (C) 2015  CERN
+.\"
+.\" This program is free software: you can redistribute it and/or modify
+.\" it under the terms of the GNU General Public License as published by
+.\" the Free Software Foundation, either version 3 of the License, or
+.\" (at your option) any later version.
+.\"
+.\" This program is distributed in the hope that it will be useful,
+.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
+.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+.\" GNU General Public License for more details.
+.\"
+.\" You should have received a copy of the GNU General Public License
+.\" along with this program.  If not, see <http://www.gnu.org/licenses/>.
+.TH CTA 1CTA "August 2016" CTA CTA
+.SH NAME
+cta \- main command line interface to the CERN Tape Archive
+.SH SYNOPSIS
+.BI "cta"
+
+.SH DESCRIPTION
+Please refer to the help provided within the \fBcta\fP command. Just type \fBcta\fP for generic help or
+\fBcta <command>\fP for help on a specific command.
+
+.SH AUTHOR
+\fBCTA\fP Team
+