Added badges in the README.md

README.md

+[![pipeline status](https://gitlab.irstea.fr/pole-is/bundles/ng-model-generator-bundle/badges/master/pipeline.svg)](https://gitlab.irstea.fr/pole-is/bundles/ng-model-generator-bundle/commits/master)
+[![PHP version](https://badge.fury.io/ph/irstea%2Fng-model-generator-bundle.png)](https://packagist.org/packages/irstea/ng-model-generator-bundle)
\ No newline at end of file