[VOL-5545] Update voltha docs

- release notes for VOLTHA versions 2.6 to 2.15 with new Jira links and adjust release schedule details
- update old links
- remove ONF references and links
- update e-mail links
- update copright notices

Change-Id: Id6be18986a8f52f2dfcc07e2b0d2efcb0ae1c0e4
Signed-off-by: serkant.uluderya <serkant.uluderya@netsia.com>
diff --git a/release_notes/voltha_2.15.rst b/release_notes/voltha_2.15.rst
new file mode 100644
index 0000000..2dd57b6
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+.. figure:: images/voltha.svg
+   :alt: voltha- Release Notes
+   :width: 40%
+   :align: center
+
+
+VOLTHA 2.15 Release Notes
+=========================
+
+See the `full release notes on Confluence <https://lf-broadband.atlassian.net/wiki/spaces/HOME/pages/436568065/Release+Notes+for+VOLTHA+Release+2.15>`_
+
+
+Documentation
+-------------
+
+As usual documentation is published on https://docs.voltha.org
+
+
+Jira stories
+------------
+A full list of stories and bugs completed can be found under the
+`VOLTHA 2.15 <https://lf-broadband.atlassian.net/projects/VOL/versions/10041/tab/release-report-all-issues>`_ release page in Jira.
+
+Get Involved
+------------
+We'd love to accept your patches and contributions to the VOLTHA project, join the community!
+
+| Here are a few resources to get you started:
+
+
+Index/Entry points
+++++++++++++++++++
+
+  - `https://docs.voltha.org <https://docs.voltha.org/master/index.html>`_
+  - `Getting Started <https://docs.voltha.org/master/overview/contributing.html>`_
+
+HOWTO
++++++
+
+  - `Code, Documentation, Makefiles <https://docs.voltha.org/master/howto/index.html>`_
+  - `Setup a test pod <https://docs.voltha.org/master/overview/lab_setup.html>`_
+  - `Troubleshooting <https://docs.voltha.org/master/overview/troubleshooting.html>`_
+
+Testing
++++++++
+
+  - `Automation <https://docs.voltha.org/master/testing/voltha_test_automation.html>`_
+  - `Robot testing harness <https://docs.voltha.org/master/testing/index.html>`_
+  - `voltha-system-tests <https://docs.voltha.org/master/voltha-system-tests/README.html>`_
+
+CLI Tools
++++++++++
+
+  - `BBSIM <https://docs.voltha.org/master/bbsim/docs/source/index.html>`__
+  - `voltctl <https://docs.voltha.org/master/voltctl/README.html?highlight=voltctl>`__
+
+Slack
++++++
+
+  - `voltha-discuss <https://lfbroadband.slack.com/archives/C081SFNQ7JS>`_
+  - `voltha-tst <https://lfbroadband.slack.com/archives/C081JJ2K26T>`_
+
+Mailing List
+++++++++++++
+
+  - `Discuss@lists.voltha.org <https://lists.voltha.org/g/Discuss/messages>`_
+
+Bi-Weekly TST Meetings
+++++++++++++++++++++++
+
+  - `Calendar <https://zoom-lfx.platform.linuxfoundation.org/meetings/broadband-fund?view=month>`_
+  - `Rolling Agenda/Minutes <https://lf-broadband.atlassian.net/wiki/spaces/HOME/pages/6291531/Running+VOLTHA+TST+Meeting+Minutes>`_
+
+Websites
+++++++++
+
+  - `VOLTHA <https://lfbroadband.org/projects/voltha/>`_
+  - `docs.voltha.org <https://docs.voltha.org>`_
+  - `Wiki <https://lf-broadband.atlassian.net/wiki>`_
+
+|