Fix typo

The word 'Adresse' has only one 'l' in french
Fix type in FOSUserBundle.fr.xliff

The word 'Adresse' has only one 'd' in french
Merge pull request #376 from bodrak/patch-2

Fix type in FOSUserBundle.fr.xliff
Merge pull request #375 from bodrak/patch-1

Fix typo in SonataUserBundle.fr.xliff
Added CONTRIBUTING.md file
Merge pull request #377 from Bladrak/contributing

Added CONTRIBUTING.md file
Merge remote-tracking branch 'refs/remotes/sonata-project/master'