📝 License badge

README.rst

@@ -26,6 +26,10 @@
    :target: https://codecov.io/gh/sphinx-doc/sphinx
    :alt: Code Coverage Status (Codecov)
 
+.. image:: https://img.shields.io/badge/License-BSD%203--Clause-blue.svg
+   :target: https://opensource.org/licenses/BSD-3-Clause
+   :alt: BSD 3 Clause
+
 Sphinx is a tool that makes it easy to create intelligent and beautiful
 documentation for Python projects (or other documents consisting of multiple
 reStructuredText sources), written by Georg Brandl.  It was originally created