Update README with Gemma 3 support and contributor acknowledgments

PiperOrigin-RevId: 825588241

Author: pculliton

README.md

@@ -519,13 +519,19 @@ Mikhaylov, Eugene Kliuchnikov, Jan Wassenberg, Jyrki Alakuijala, Lode
 Vandevenne, Luca Versari, Martin Bruse, Phil Culliton, Sami Boukortt, Thomas
 Fischbacher and Zoltan Szabadka. It was removed in 2025-09.
 
-Gemma-2 support was implemented in June/July 2024 with the help of several
-people.
+Gemma 2 support was implemented in June/July 2024 with the help of several
+people including Daniel Keysers and Phil Culliton.
 
 PaliGemma support was implemented in September 2024 with contributions from
 Daniel Keysers.
 
+Gemma 3 support was implemented in January-March 2025 with contributions from
+Daniel Keysers and Phil Culliton.
+
 [Jan Wassenberg](mailto:[email protected]) has continued to contribute many
 improvements, including major gains in efficiency, since the initial release.
 
+[Phil Culliton](mailto:[email protected]) has worked on model releases,
+eval and validation, GTM, and quantization, since the initial release.
+
 This is not an officially supported Google product.