add piwik installation

www/analytics/libs/sparkline/README

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+#
+# Sparkline PHP Graphing Library
+# Copyright 2004 James Byers <jbyers@gmail.com>
+# http://sparkline.org
+#
+# Dual-licensed under the BSD (LICENSE-BSD.txt) and GPL (LICENSE-GPL.txt)
+# licenses.
+#
+# $Id: README,v 1.3 2008/03/11 19:12:49 jbyers Exp $
+#
+
+Installation:
+-------------
+
+Sparkline does not have any installation requirements.  See the
+samples directory for usage ideas.
+
+Requirements:
+-------------
+
+Sparkline requires PHP 4.0.6 or newer and GD 2.0 built as a PHP
+module.
+
+Troubleshooting and Support:
+----------------------------
+
+See http://sparkline.org for troubleshooting advice and support.
+
+Bugs, Features:
+---------------
+
+Please submit bugs to the bug tracker:
+
+  http://sourceforge.net/tracker/?group_id=122936&atid=694962
+
+Please submit feature requests to the RFE tracker:
+
+  http://sourceforge.net/tracker/?group_id=122936&atid=694965
+
+License:
+--------
+
+The library is dual-licensed under the BSD and GPL licenses.  You
+may use this library under the terms of either license.  See
+LICENSE-BSD.txt and LICENSE-GPL.txt.
+