Add Github Actions badge

Author: zariiii9003

README.rst

@@ -3,7 +3,7 @@ python-can
 
 |release| |python_implementation| |downloads| |downloads_monthly| |formatter|
 
-|docs| |build_travis| |coverage| |mergify|
+|docs| |github-actions| |build_travis| |coverage| |mergify|
 
 .. |release| image:: https://img.shields.io/pypi/v/python-can.svg
    :target: https://pypi.python.org/pypi/python-can/
@@ -29,6 +29,10 @@ python-can
    :target: https://python-can.readthedocs.io/en/stable/
    :alt: Documentation
 
+.. |github-actions| image:: https://github.com/hardbyte/python-can/actions/workflows/build.yml/badge.svg?branch=develop
+   :target: https://github.com/hardbyte/python-can/actions/workflows/build.yml
+   :alt: Github Actions workflow status
+
 .. |build_travis| image:: https://img.shields.io/travis/com/hardbyte/python-can/develop.svg?label=Travis%20CI
    :target: https://travis-ci.com/hardbyte/python-can
    :alt: Travis CI Server for develop branch