Release notes draft for Apache Solr 9.0

[Anshum Gupta]

Hi everyone,

Please find the initial draft of the release notes for Solr 9.0 here:
https://cwiki.apache.org/confluence/x/jL-kCw

Please let me know if you need me to update/add something, or feel free to
do so yourself.

-- 
Anshum Gupta