Update readme with some links

README.md

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 # dax_obscore
 
-Tools to generate ObsCore data for LSST processed images using Butler Gen 3.
+[![pypi](https://img.shields.io/pypi/v/lsst-dax-obscore.svg)](https://pypi.org/project/lsst-dax-obscore/)
+[![codecov](https://codecov.io/gh/lsst-dm/dax_obscore/graph/badge.svg?token=TI73D2SG4S)](https://codecov.io/gh/lsst-dm/dax_obscore)
+
+Tools to generate [IVOA ObsCore](https://www.ivoa.net/documents/ObsCore/) data and process [IVOA SIAv2](https://www.ivoa.net/documents/SIA/) queries for data stored in a Butler repository.
+
+* [Rubin Observatory Data Butler](https://github.com/lsst/daf_butler)
+* [Overview of SIAv2 implementation](https://doi.org/10.48550/arXiv.2501.00544)
+
+PyPI: [lsst-dax-obscore](https://pypi.org/project/lsst-dax-obscore/)