Add Open Home Foundation link (home-assistant#116405)

README.rst

@@ -7,6 +7,8 @@ Check out `home-assistant.io <https://home-assistant.io>`__ for `a
 demo <https://demo.home-assistant.io>`__, `installation instructions <https://home-assistant.io/getting-started/>`__,
 `tutorials <https://home-assistant.io/getting-started/automation/>`__ and `documentation <https://home-assistant.io/docs/>`__.
 
+This is a project of the `Open Home Foundation <https://www.openhomefoundation.org/>`__.
+
 |screenshot-states|
 
 Featured integrations
@@ -25,4 +27,4 @@ of a component, check the `Home Assistant help section <https://home-assistant.i
 .. |screenshot-states| image:: https://raw.githubusercontent.com/home-assistant/core/dev/.github/assets/screenshot-states.png
    :target: https://demo.home-assistant.io
 .. |screenshot-integrations| image:: https://raw.githubusercontent.com/home-assistant/core/dev/.github/assets/screenshot-integrations.png
-   :target: https://home-assistant.io/integrations/
+   :target: https://home-assistant.io/integrations/