added instruction to get the source code

README

@@ -4,7 +4,17 @@ Official project site for Eiffel Web Framework:
 For more information please have a look at the related wiki:
  - https://github.com/Eiffel-World/Eiffel-Web-Framework/wiki
 
-Overview:
+# How to get the source code? #
+ - 
+= Get the source code =
+
+ - git clone https://github.com/Eiffel-World/Eiffel-Web-Framework.git
+ - cd Eiffel-Web-Framework
+ - git submodule update --init
+ - git submodule foreach git pull origin master
+ - git submodule foreach git checkout master
+
+# Overview #
 
  - library/ewsgi: Eiffel Web Server Gateway Interface