Add information on Java baseline in README.md

As discussed in the ESC, although LibreOffice can be built with the
Java Development Kit (JDK) version 9, the JDK 9 is no longer
supported by the JVM vendors including Oracle, Red Hat and others.
Thus, it is asserted here that JDK 11 or later should be used to build
LibreOffice.

For further information on the supported versions of JDK, and its
lifcycle, see these articles:

Oracle Java SE Support Roadmap (Updated March 22, 2022)
https://www.oracle.com/java/technologies/java-se-support-roadmap.html

OpenJDK Life Cycle and Support Policy (Updated November 22 2021)
https://access.redhat.com/articles/1299013

It should be noted that JDK 8 is still supported, but it is not usable
for building LibreOffice.

It is also documented that without Java one may lose many features that
are described in the TDF wiki article Development/Java:
https://wiki.documentfoundation.org/Development/Java

Change-Id: Id001c341a221b0fe5c07c7129956a824261d32c0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/135557
Tested-by: Jenkins
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>

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