added basic README files for all components

    heavily inspired by http://fabien.potencier.org/article/49/what-is-symfony2 and the official Symfony2 documentation

Author: lsmith77

README.md

@@ -0,0 +1,13 @@
+Serializer Component
+====================
+
+With the Serializer component its possible to handle serializing data structures,
+including object graphs, into array structures or other formats like XML and JSON.
+It can also handle deserializing XML and JSON back to object graphs.
+
+Resources
+---------
+
+Unit tests:
+
+https://github.com/symfony/symfony/tree/master/tests/Symfony/Tests/Component/Serializer