add description for rf3

Author: markgeejw

source/rest-api/fold.rst

@@ -10,6 +10,7 @@ Currently, we support the following models:
 - **ESMFold**: Open-sourced ESMFold model. `GitHub link <https://github.com/facebookresearch/esm>`__, `Reference <https://www.science.org/doi/10.1126/science.ade2574>`__. Licensed under `MIT <https://choosealicense.com/licenses/mit/>`__.
 - **AlphaFold2**: Open-sourced Alphafold 2 implementation using ColabFold. `GitHub link <https://github.com/sokrypton/ColabFold>`__, `Reference <https://www.nature.com/articles/s41592-022-01488-1>`__. Licensed under `MIT <https://choosealicense.com/licenses/mit/>`__.
 - **Boltz-2, Boltz-1x, Boltz-1**: Open-source Boltz models. `GitHub link <https://github.com/jwohlwend/boltz>`__, `Boltz-1 reference <https://www.biorxiv.org/content/10.1101/2024.11.19.624167v1>`__, `Boltz-2 <https://www.biorxiv.org/content/10.1101/2025.06.14.659707v1>`__. Licensed under `MIT <https://choosealicense.com/licenses/mit/>`__. 
+- **RosettaFold-3**: Open-source RosettaFold-3 model. `GitHub link <https://github.com/RosettaCommons/modelforge>`__, `Reference <https://www.biorxiv.org/content/10.1101/2025.08.14.670328v2>`__. Licensed under `BSD-3 <https://choosealicense.com/licenses/bsd-3-clause/>`__. 
 
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