Remove code documentation from README

README

@@ -14,10 +14,10 @@ Introduction:
 -------------
 RoundCube Webmail is a browser-based multilingual IMAP client with an
 application-like user interface. It provides full functionality you expect
-from an e-mail client, including MIME support, address book, folder manipulation,
+from an e-mail client, including MIME support, address book, folder management,
 message searching and spell checking. RoundCube Webmail is written in PHP and
-requires the MySQL, PostgreSQL or SQLite database. The user interface is fully skinnable
-using XHTML and CSS 2.
+requires the MySQL, PostgreSQL or SQLite database. The user interface is fully
+skinnable using XHTML and CSS 2.
 
 This project is meant to be a modern webmail solution which is easy to
 install/configure and that runs on a standard PHP plus MySQL, PostgreSQL or SQLite
@@ -35,39 +35,18 @@ For detailed instructions on how to install RoundCube webmail on your server,
 please refer to the INSTALL document in the same directory as this document.
 
 
-Licensing: 
+Licensing:
 ----------
 This product is distributed under the GPL. Please read through the file
 LICENSE for more information about our license.
 
 
-How it works:
+Contribution:
 -------------
-The main authority for the RoundCube access is the IMAP server. If
-'auto_create_user' is set to TRUE in config/main.inc.php a new record in the
-user table will be created once the IMAP login succeeded. This user record does
-not store a password, it's just used to assign identities, contacts and cache
-records. If you have 'auto_create_user' set to FALSE only IMAP logins which
-already have a corresponding entry in the user's table (username and hostname)
-will be allowed.
-
-
-Code Layout:
-------------
-Basic sequence (index.php):
-  - index.php -> rcmail_load_gui -> new rcmail_template -> rcmail_template::send
-  - authentication details in this sequence
-
-Tasks
-  - index.php limits tasks to set list
-  - can see task in roundcube link when you mouse over it
-  - task templates stored in skins/default/templates
-  - templates "roundcube:" tokens that get replaced in rcmail_template class
-
-program/include/rcube_shared.inc
-  - defines rcube_html_page, class that lays out a roundcube web page
-  - defines form control classes
-  - provides common functions
+Want to help make RoundCube the best webmail solution ever?
+RoundCube is open source software. Our developers and contributors all
+are volunteers and we're always looking for new additions and resources.
+For more information visit http://roundcube.net/contribute
 
 
 Contact: