README: update with github friendly content

README.txt

@@ -1,2 +1,22 @@
-For more information on Chamilo, open documentation/index.html in this directory with a web browser.
+Chamilo LMS
+=============
 
+See documentation/index.html for a complete overview of Chamilo.
+
+Installation
+------------
+
+You need a working web server + PHP + MySQL setup.
+Refer to documentation/installation_guide.html for instructions.
+
+Reporting bugs
+--------------
+
+Please submit any bugs, feature requests and non-trivial patches to
+http://support.chamilo.org/
+
+Learn more
+----------
+
+For news, events and more information on Chamilo LMS please visit
+http://www.chamilo.org/