[2.7] update readme files for new components

Author: xabbuh

README.md

@@ -9,15 +9,8 @@ the Java Spring framework.
 Resources
 ---------
 
-Documentation:
-
-https://symfony.com/doc/2.7/book/security.html
-
-Tests
------
-
-You can run the unit tests with the following command:
-
-    $ cd path/to/Symfony/Component/Security/Http/
-    $ composer.phar install --dev
-    $ phpunit
+  * [Documentation](https://symfony.com/doc/current/components/security/index.html)
+  * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+  * [Report issues](https://github.com/symfony/symfony/issues) and
+    [send Pull Requests](https://github.com/symfony/symfony/pulls)
+    in the [main Symfony repository](https://github.com/symfony/symfony)