Add license, remove composer.lock

[tacman]

Hi, thanks for this bundle. I ran across it when I was getting ready to publish my own, and wanted to see how mine compared with yours (and incorporate some of your ideas). Of course, I wanted to check the license first.

Mine runs with the latest Symfony and PHP, uses Attributes rather than annotations, etc. But not surprisingly, there are some similarities.

Tiny note: composer.lock shouldn't be checked into bundles.