Update README.md

Author: lee1043

README.md

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+## CLIVAR ENSO Metrics Package
+
 ENSO metrics package for climate model evaluation
 Metrics and collections devised by CLIVAR ENSO group
 
-Contact details:
+### Contact
+
 Eric Guilyardi <[email protected]>
 Yann Planton <[email protected]>
+Jiwoo Lee <[email protected]>
+
+### Reference
 
-Reference:
 Planton, Y., E. Guilyardi, A. T. Wittenberg, J. Lee, P. J. Gleckler, T. Bayr, S. McGregor, M. J. McPhaden, S. Power, R. Roehrig,  J. Vialard, A. Voldoire, 2021: A New Way of Evaluating ENSO in Climate Models: The CLIVAR ENSO Metrics Package. Bulletin of the American Meteorological Society, 102, 1073-1080, [doi: 10.1175/BAMS-D-19-0337.A](https://doi.org/10.1175/BAMS-D-19-0337.A)