README.md: Add badges

Author: TeddyAndrieux

README.md

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+[![GitHub release](https://img.shields.io/github/release/scality/crl-operator.svg)](https://github.com/scality/crl-operator/releases/latest)
 [![Post Merge](https://github.com/scality/crl-operator/actions/workflows/post-merge.yaml/badge.svg)](https://github.com/scality/crl-operator/actions/workflows/post-merge.yaml)
 
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 # crl-operator
 
 A Kubernetes operator for managing Certificate Revocation Lists (CRLs) in your cluster