Update README.md

README.md

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 polarPcolor draws a pseudocolor plot in polar coordinates with a polar grid.
 
 [![View pcolor in polar coordinates on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://se.mathworks.com/matlabcentral/fileexchange/49040-pcolor-in-polar-coordinates)
+[![DOI](https://zenodo.org/badge/248936816.svg)](https://zenodo.org/badge/latestdoi/248936816)
 
+## Summary
 polarPcolor aims to represent a pseudocolour plot in polar coordinates, with a radial grid to allow clear visualization of the data. It is well suited for Plan Position Indicator (PPI) scan for radar or lidar for example [1]. A similar function is available in ref. [2], which propose a visualization in 3D.
 
-References:
+## References
 
 [1] Cheynet, E., Jakobsen, J. B., Snæbjörnsson, J., Reuder, J., Kumer, V., & Svardal, B. (2017). Assessing the potential of a commercial pulsed lidar for wind characterisation at a bridge site. Journal of Wind Engineering and Industrial Aerodynamics, 161, 17-26. http://dx.doi.org/10.1016/j.jweia.2016.12.002