news item and release-notes if relevant for 5.0.0-M3

Signed-off-by: Håvard Ottestad <hmottestad@gmail.com>

site/content/news/rdf4j-500-M3.md

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+---
+title: "RDF4J 5.0.0 Milestone 3"
+date: 2024-06-05T12:40:28+0200
+layout: "single"
+categories: ["news"]
+---
+Milestone number 3 of the upcoming 5.0.0 release of RDF4J is now available for download.
+
+RDF4J 5.0.0 is a minor release focusing on ... .
+
+This milestone build is not yet feature-complete, but we are putting it out to receive early feedback on all the improvements we have put in.
+
+<!--more-->
+
+ - [issues fixed in 5.0.0 Milestone 3](https://github.com/eclipse/rdf4j/issues?q=is%3Aissue+label%3AM3+is%3Aclosed+milestone%3A5.0.0)
+ - [issues planned for 5.0.0](https://github.com/eclipse/rdf4j/milestone/80)
+
+### Links
+
+- [Download RDF4J](/download/)