Improve README

README.md

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 Remove finilizers and delete all the object related to a CRD in a given namespace
 
+## Git repositories
+
+* Main repo: https://gitlab.comwork.io/oss/clean-k8s-objects
+* Github mirror: https://github.com/idrissneumann/clean-k8s-objects.git
+* Gitlab mirror: https://gitlab.com/ineumann/clean-k8s-objects.git
+* Froggit mirror: https://lab.frogg.it/ineumann/clean-k8s-objects.git
+
+## Usages
+
 ```shell
 ./clean.sh -n <NAMESPACE> -c <CRD>
 ```