Update README.rst

Author: mrbuche

README.rst

@@ -2,7 +2,7 @@
 Structural Dynamics Python Libraries
 ####################################
 
-|documentation| |build| |codecov| |coveralls| |pylint|
+|documentation| |build| |codecov| |coveralls| |pylint| |docker|
 
 This repository houses SDynPy, a Python module built for doing structural dynamics analysis using Python.
 It contains core objects that define test geometry and data.  It contains readers and writers for common data formats.
@@ -34,3 +34,6 @@ Information
 
 .. |codecov| image:: https://img.shields.io/codecov/c/github/sandialabs/sdynpy?label=Codecov&logo=codecov
     :target: https://codecov.io/gh/sandialabs/sdynpy
+
+.. |docker| image:: https://img.shields.io/docker/v/dprohe/sdynpy?color=0db7ed&label=Docker%20Hub&logo=docker&logoColor=0db7ed
+    :target: https://hub.docker.com/r/dprohe/sdynpy