[TASK] Add composer.json

Change-Id: I5391954c1a0d0a8aa3ac4a6b49b263f04d3e20f0
Reviewed-on: http://review.typo3.org/35353
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>