Add Nightly Docker Image Status badge in readme (#6570)

* Add Nightly Docker Image Status badge in readme

* refein

* address review
Co-authored-by: Noneflow-ci-bot <69100618+oneflow-ci-bot@users.noreply.github.com>

README.md

@@ -3,7 +3,9 @@
 **OneFlow is a performance-centered and open-source deep learning framework.**
 
 [![Simple CI](https://github.com/Oneflow-Inc/oneflow/actions/workflows/simple.yml/badge.svg)](https://github.com/Oneflow-Inc/oneflow/actions/workflows/simple.yml)
-[![Documentation Status](https://readthedocs.org/projects/oneflow/badge/?version=master)](https://oneflow.readthedocs.io/en/master/?badge=master)
+[![Nightly Docker Image](https://github.com/Oneflow-Inc/docker-images/actions/workflows/oneflow-nightly.yml/badge.svg)](https://github.com/Oneflow-Inc/docker-images/actions/workflows/oneflow-nightly.yml)
+[![Nightly Release](https://github.com/Oneflow-Inc/oneflow/actions/workflows/release.yml/badge.svg)](https://github.com/Oneflow-Inc/oneflow/actions/workflows/release.yml)
+[![Documentation](https://readthedocs.org/projects/oneflow/badge/?version=master)](https://oneflow.readthedocs.io/en/master/?badge=master)
 
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