Update 2025.md

Author: cmihaigabriel

_editions/2025.md

@@ -13,6 +13,9 @@ MediaEval goes beyond other benchmarks and data science challenges in that it al
 scores to also working to achieve deeper understanding about the challenges. For example, characteristics of the data, strengths and weaknesses of particular types of approaches, and observations 
 about the evaluation procedure.
 
+##### Registration:
+Signup for MediaEval 2025 is now open via the [MediaEval 2025 registration form](https://forms.gle/y7v1VLP7D9vsbuqv5).
+
 ##### MediaEval 2025 Schedule:
 * Registration for task participation opens: April 2025
 * Development data release: May 2025