Update README with CATE repository information

Added information about CATE's submission to the Stanford Digital Repository and its inclusion in the OpenSource@Stanford Project Registry.

Author: DeshanPerera

README.md

@@ -195,6 +195,13 @@ To cite CATE's code with Apollo's integration, please cite the Zenodo release:
 
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.15515468.svg)](https://doi.org/10.5281/zenodo.15515468)
 
+CATE has been submitted to the Stanford Digital Repository:
+
+[![Static Badge](https://img.shields.io/badge/Stanford_Digital_Repository-DOI?logoColor=%238f1414&label=DOI&labelColor=%235d5d5d&color=%238f1414)
+](https://doi.org/10.25740/pn823sb3191)
+
+It is also featured in the [OpenSource@Stanford Project Registry](https://opensource.stanford.edu/projects-registry).
+
 [_Return to contents_](#contents)
 
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