news item and release-notes if relevant for 5.3.0-M1

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

Author: hmottestad

site/content/news/rdf4j-530-M1.md

@@ -0,0 +1,20 @@
+---
+title: "RDF4J 5.3.0 Milestone 1"
+date: 2025-12-21T23:16:10+0100
+layout: "single"
+categories: ["news"]
+---
+Milestone number 1 of the upcoming 5.3.0 release of RDF4J is now available for download.
+
+RDF4J 5.3.0 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 5.3.0 Milestone 1](https://github.com/eclipse/rdf4j/issues?q=is%3Aissue+label%3AM1+is%3Aclosed+milestone%3A5.3.0)
+ - [issues planned for 5.3.0](https://github.com/eclipse/rdf4j/milestone/124)
+
+### Links
+
+- [Download RDF4J](/download/)