Add link to license page to index.rst

Author: hackebrot

doc/en/index.rst

@@ -7,6 +7,7 @@ pytest: helps you write better programs
 **a mature full-featured Python testing tool**
 
  - runs on Posix/Windows, Python 2.6-3.5, PyPy and (possibly still) Jython-2.5.1
+ - free and open source software, distributed under the terms of the :ref:`MIT license <license>`
  - **well tested** with more than a thousand tests against itself
  - **strict backward compatibility policy** for safe pytest upgrades
  - :ref:`comprehensive online <toc>` and `PDF documentation <pytest.pdf>`_

doc/en/license.rst

@@ -1,3 +1,5 @@
+.. _license:
+
 License
 -------