Added `contrib/README'

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+The files in this directory may be used to perform common tasks that aren't
+exactly `collectd's job. They may or may not require in-depth knowlege of RRD
+files and/or `collectd's inner workings. Use at your own risk.
+
+add_rra.sh
+----------
+  Before version 3.9.0 collectd used to create a different set of RRAs. The
+most detailed of these old RRAs hat a one minute resolution. This script can be
+used to add three more RRAs: minimum, maximum and average with a ten second
+resolution and 2200 rows (~6 hours). This will make houly statistics much more
+interesting. Please note that no sanity- checking whatsoever is performed. You
+can seriously fuck up your RRD files if you don't know what you're doing.
+
+collectd2html.pl
+----------------
+  This script by Vincent Stehlé will search for RRD files in
+`/var/lib/collectd/' and generate an HTML file and a directory containing
+several PNG files which are graphs of the RRD files found.
+
+collectd.conf
+-------------
+  A sample config file. Used by the Debian package.
+
+collection.cgi
+--------------
+  Sample CGI script that creates graphs on the fly. The Perl module `RRDs' is
+needed (Debian package `librrds-perl').
+
+init.d-rh7
+----------
+  Sample init script. Used by the RPM specfile.