More user-friendly index doc

docs/index.md

@@ -8,3 +8,12 @@ with Doctrine ORM or Doctrine MongoDB ODM.
 
 To use Doctrine ORM or ODM, you will need [DoctrineORMModule](https://github.com/doctrine/DoctrineORMModule) 
 or [DoctrineMongoODMModule](https://github.com/doctrine/DoctrineMongoODMModule) respectively.
+
+You can find more details about the features offered by DoctrineModule:
+
+* [Authentication documentation](https://github.com/doctrine/DoctrineModule/blob/master/docs/authentication.md): this explains how you can use the DoctrineModule authentication adapter and authentication storage adapter to provide a simple way to authenticate users using Doctrine.
+* [Caching documentation](https://github.com/doctrine/DoctrineModule/blob/master/docs/caching.md): DoctrineModule provides simple classes to allow easier caching using Doctrine.
+* [CLI documentation](https://github.com/doctrine/DoctrineModule/blob/master/docs/cli.md): learn how to use the Doctrine 2 command line tool, and how to add your own command.
+* [Hydrator documentation](https://github.com/doctrine/DoctrineModule/blob/master/docs/hydrator.md): if you are using Zend Framework 2 Forms (and I hope you are !), DoctrineModule hydrator provides a powerful hydrator that allow you to easily deal with OneToOne, OneToMany and ManyToOne relationships when using forms.
+* [Paginator documentation](https://github.com/doctrine/DoctrineModule/blob/master/docs/paginator.md): discover how to use the DoctrineModule Paginator adapter.
+* [Validator documentation](https://github.com/doctrine/DoctrineModule/blob/master/docs/validator.md): this chapter explains how to use ObjectExists and NoObjectExists validator, that allow you to easily validate if a given entity exists or not.