Add rel7.2.0.rst landing page

R1/source/releases/rel7.2.0.rst

+.. _rel7.2.0:
+
+Varnish Cache 7.2.0
+===================
+
+* Source download `varnish-7.2.0.tgz </downloads/varnish-7.2.0.tgz>`_
+
+* SHA256=1da8a97ed5f7b7d4d5e04fc5c96fc9a85cb3a20d076eba2b18951f4b306c9686
+
+Varnish Cache 7.2.0 is a regular bi-annual "fresh" release. It supersedes
+the :ref:`rel7.1.0` release.
+
+More information:
+
+* List of most important `Changes in 7.2 <https://varnish-cache.org/docs/7.2/whats-new/changes-7.2.html>`_
+* Help on `Upgrading to Varnish 7.2 <https://varnish-cache.org/docs/7.2/whats-new/upgrading-7.2.html>`_
+* `Full changes.rst entry for 7.2.0 <https://github.com/varnishcache/varnish-cache/blob/7.2/doc/changes.rst#varnish-cache-720-2022-09-15>`_
+
+For installation instructions including information about cloud images see
+`the Varnish Installation Manual </docs/trunk/installation/index.html>`_
+
+We recommend using the manual installation procedure available at:
+https://packagecloud.io/varnishcache/varnish72/install#manual