Add badges.

README.rst

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+===========
+Jumpstarter
+===========
+
+|build-status| |documentation| |coverage| |license| |wheel| |pyversion| |pyimp| |ocbackerbadge| |ocsponsorbadge|
+
+.. |build-status| image:: https://github.com/celery/jumpstarter/workflows/Unit%20Test/badge.svg
+    :alt: Unit Test Status
+    :target: https://github.com/celery/jumpstarter/actions?query=workflow%3A%22Unit+Test%22+branch%3Amain
+
+.. |documentation| image:: https://readthedocs.org/projects/jumpstarter/badge/?version=latest
+   :target: https://jumpstarter.readthedocs.io/en/latest/?badge=latest
+   :alt: Documentation Status
+
+.. |coverage| image:: https://codecov.io/github/celery/jumpstarter/coverage.svg?branch=main
+    :target: https://codecov.io/github/celery/jumpstarter?branch=main
+
+.. |license| image:: https://img.shields.io/pypi/l/jumpstarter.svg
+    :alt: BSD License
+    :target: https://opensource.org/licenses/BSD-3-Clause
+
+.. |wheel| image:: https://img.shields.io/pypi/wheel/jumpstarter.svg
+    :alt: Celery can be installed via wheel
+    :target: https://pypi.org/project/celery/
+
+.. |pyversion| image:: https://img.shields.io/pypi/pyversions/jumpstarter.svg
+    :alt: Supported Python versions.
+    :target: https://pypi.org/project/celery/
+
+.. |pyimp| image:: https://img.shields.io/pypi/implementation/jumpstarter.svg
+    :alt: Supported Python implementations.
+    :target: https://pypi.org/project/celery/
+
+.. |ocbackerbadge| image:: https://opencollective.com/celery/backers/badge.svg
+    :alt: Backers on Open Collective
+    :target: #backers
+
+.. |ocsponsorbadge| image:: https://opencollective.com/celery/sponsors/badge.svg
+    :alt: Sponsors on Open Collective
+    :target: #sponsors
+
+.. |downloads| image:: https://pepy.tech/badge/jumpstarter
+    :alt: Downloads
+    :target: https://pepy.tech/project/celery