[Attributes] Add attributes overview for 6.2

Author: alexandre-daubois

reference/attributes.rst

@@ -0,0 +1,96 @@
+.. index::
+    single: Attributes
+
+Symfony Attributes Overview
+===========================
+
+Attributes are the successor of annotation since PHP 8. Attributes are native
+to the language and Symfony takes full advantage of them across the framework
+ans its different components.
+
+Doctrine Bridge
+~~~~~~~~~~~~~~~
+
+* :doc:`UniqueEntity </reference/constraints/UniqueEntity>`
+
+Command
+~~~~~~~
+
+* :ref:`AsCommand <console_registering-the-command>`
+
+Contracts
+~~~~~~~~~
+
+* :ref:`Required <autowiring-calls>`
+* :ref:`SubscribedService <service-subscribers-service-subscriber-trait>`
+
+Dependency Injection
+~~~~~~~~~~~~~~~~~~~~
+
+* :doc:`AsDecorator </service_container/service_decoration>`
+* :ref:`AsTaggedItem <tags_as-tagged-item>`
+* :ref:`Autoconfigure <lazy-services_configuration>`
+* :ref:`AutoconfigureTag <di-instanceof>`
+* :ref:`Autowire <autowire-attribute>`
+* :doc:`MapDecorated </service_container/service_decoration>`
+* :ref:`TaggedIterator <tags_reference-tagged-services>`
+* :ref:`TaggedLocator <service-subscribers-locators_defining-service-locator>`
+* :ref:`Target <autowiring-multiple-implementations-same-type>`
+* :ref:`When <service-container_limiting-to-env>`
+
+EventDispatcher
+~~~~~~~~~~~~~~~
+
+* :ref:`AsEventListener <event-dispatcher_event-listener-attributes>`
+
+FrameworkBundle
+~~~~~~~~~~~~~~~
+
+* :ref:`AsRoutingConditionService <routing-matching-expressions>`
+
+HttpKernel
+~~~~~~~~~~
+
+* :doc:`AsController </controller/service>`
+* :ref:`Cache <http-cache-expiration-intro>`
+* :class:`Symfony\\Component\\HttpKernel\\Attribute\\MapDateTime`
+
+Messenger
+~~~~~~~~~
+
+* :ref:`AsMessageHandler <messenger-handler>`
+
+Routing
+~~~~~~~
+
+* :doc:`Route </routing>`
+
+Security
+~~~~~~~~
+
+* :ref:`CurrentUser <security-json-login>`
+* :ref:`IsGranted <security-securing-controller-annotations>`
+
+Serializer
+~~~~~~~~~~
+
+* :ref:`Context <serializer_serializer-context>`
+* :ref:`DiscriminatorMap <serializer_interfaces-and-abstract-classes>`
+* :ref:`Groups <component-serializer-attributes-groups-annotations>`
+* :ref:`Ignore <serializer_ignoring-attributes>`
+* :ref:`MaxDepth <serializer_handling-serialization-depth>`
+* :ref:`SerializedName <serializer_name-conversion>`
+* :ref:`SerializedPath <serializer-enabling-metadata-cache>`
+
+Twig
+~~~~
+
+* :ref:`Template <templates-template-attribute>`
+
+Validator
+~~~~~~~~~
+
+Each validation constraint comes with a PHP attribute. See
+:doc:`/reference/constraints` for a full list of validation constraints.
+
+* :doc:`HasNamedArgument </validation/custom_constraint>`