Modified check_memory to support new procps free(1) output format

Created initial README

README.md

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+nagios-plugins
+==============
+This repository contains my collection of modified and custom written check
+plugins for [Nagios](http://www.nagios.org).
+
+Most of these are modified versions of standard plugins or very custom so
+distributing them through [NagiosExchange](https://exchange.nagios.org/) is
+not really appropriate.  I am publishing them separately so that others may
+benefit from these as well. Use them freely and please let me know is you
+encounter any issues or require changes.
+
+The latest versions, documentation and bugtracker available on my
+[GitLab instance](https://gitlab.lindenaar.net/scripts/privacyidea-checkotp)
+
+Copyright (c) 2015 Frederik Lindenaar. free for distribution under the GNU
+License, see [below](#license)
+
+
+check_memory
+------------
+nagios check script to monitor the memory on Linux systems. Due to changes in
+the output of procps v3.3 (the changelog refers to it as modernizing it), it's
+output changed and breaks the the check_memory script as shipped with many linux
+distributions. This version supports both the old and the new format so that
+is indifferent of which version of procps (to date) is used. No other changes
+were made to the script.
+
+
+<a name="license">License</a>
+-----------------------------
+These scripts, documentation & configration examples are free software: you can
+redistribute 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 script, documenatation and configuration examples are 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, download it from <http://www.gnu.org/licenses/>.