Add a changelog (#644)

Author: deguif

CHANGELOG-2.0.md

@@ -0,0 +1,16 @@
+CHANGELOG for 2.0.x
+===================
+
+This changelog references the relevant changes done in 6.0 versions.
+
+### 2.0.0-ALPHA1 (unreleased)
+
+* Added `NL` translations [[#631](https://github.com/FriendsOfSymfony/FOSOAuthServerBundle/pull/631)]
+* Fixed form submission/validation [[#643](https://github.com/FriendsOfSymfony/FOSOAuthServerBundle/pull/643)]
+
+### 2.0.0-ALPHA0 (2018-05-01)
+
+* Deprecated support for Symfony 2.x
+* Dropped support for PHP < 7.1
+* Allowed array in `supported_scopes` option [[#552](https://github.com/FriendsOfSymfony/FOSOAuthServerBundle/pull/552)]
+* Allowed overriding of `authorizeAction` rendering [[#564](https://github.com/FriendsOfSymfony/FOSOAuthServerBundle/pull/564)]