Added README file for the Roundcube framework

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+Roundcube Framework
+===================
+
+INTRODUCTION
+------------
+The Roundcube Framework is the basic library used for the Roundcube Webmail
+application. It is an extract of classes providing the core functionality for
+an email system. They can be used individually or as package for the following
+tasks:
+
+- IMAP mailbox access with optional caching
+- MIME message handling
+- Email message creation and sending through SMTP
+- General caching utilities using the local database
+- Database abstraction using PDO
+- VCard parsing and writing
+
+
+INSTALLATION
+------------
+Copy all files of this directory to your project or install it in the default
+include_path directory of your webserver. Some classes of the framework require
+one or multiple of the following [PEAR][pear] libraries:
+
+- Mail_Mime 1.8.1 or newer
+- Mail_mimeDecode 1.5.5 or newer
+- Net_SMTP (latest from https://github.com/pear/Net_SMTP/)
+- Net_IDNA2 0.1.1 or newer
+- Auth_SASL 1.0.6 or newer
+
+
+USAGE
+-----
+The Roundcube Framework provides a bootstrapping file which registers an
+autoloader and sets up the environment necessary for the Roundcube classes.
+In order to make use of the framework, simply include the bootstrap.php file
+from this directory in your application and start using the classes by simply
+instantiating them.
+
+If you wanna use more complex functionality like IMAP access with database
+caching or plugins, the rcube singleton helps you loading the necessary files:
+
+<?php
+
+define('RCUBE_CONFIG_DIR',  '<path-to-config-directory>');
+define('RCUBE_PLUGINS_DIR', '<path-to-roundcube-plugins-directory');
+
+require_once '<path-to-roundcube-framework/bootstrap.php';
+
+$rcube = rcube::get_instance(rcube::INIT_WITH_DB | rcube::INIT_WITH_PLUGINS);
+$imap = $rcube->get_storage();
+
+// do cool stuff here...
+
+?>
+
+
+LICENSE
+-------
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License (**with exceptions
+for plugins**) 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 [www.gnu.org/licenses/][gpl].
+
+This file forms part of the Roundcube Webmail Framework for which the
+following exception is added: Plugins which merely make function calls to the
+Roundcube Webmail Framework, and for that purpose include it by reference
+shall not be considered modifications of the software.
+
+If you wish to use this file in another project or create a modified
+version that will not be part of the Roundcube Webmail Framework, you
+may remove the exception above and use this source code under the
+original version of the license.
+
+For more details about licensing and the exceptions for skins and plugins
+see [roundcube.net/license][license]
+
+
+CONTACT
+-------
+For any bug reports or feature requests please refer to the tracking system
+at [trac.roundcube.net][tracreport] or subscribe to our mailing list.
+See [roundcube.net/support][support] for details.
+
+You're always welcome to send a message to the project admins:
+hello(at)roundcube(dot)net
+
+
+[pear]:         http://pear.php.net
+[gpl]:          http://www.gnu.org/licenses/
+[license]:      http://roundcube.net/license
+[support]:      http://roundcube.net/support
+[tracreport]:   http://trac.roundcube.net/wiki/Howto_ReportIssues
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