Adding README.markdown file

git-svn-id: http://joomlacode.org/svn/joomla/development/trunk@22193 6f6e1ebd-4c2b-0410-823f-f34bde69bce9

docs/README.markdown

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+Joomla CMS Manual
+=================
+
+The *Joomla CMS Manual* is a set of xml files for automatically generating documentation pdf files. It uses `ant` as building tool and `publican` for building pdf files. It is free and open source software,
+distributed under the GNU General Public License version 2 or later.  The Joomla Content Management System (CMS) is built on
+top of the *Joomla Platform*.  For more information about the Joomla CMS visit: http://www.joomla.org/about-joomla.html
+
+You can find out more about Joomla development *(though not platform specific)* at: http://docs.joomla.org/Developers
+
+You can discuss *Joomla Platform* development at: http://groups.google.com/group/joomla-dev-platform
+
+
+Requirements
+------------
+
+* PHP 5.3+
+
+
+Installation
+------------
+
+Get the source code from GIT:
+
+    git clone git://github.com/joomla/joomla-platform.git
+
+_Please ensure you add the following path to your local .gitignore file: tests/test_application/cache_
+