Update readme with project details

README.md

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-# pymcc
+# pymcc
+
+Python bindings for multiscale curvature classification (MCC) of point cloud data
+
+See [**pymccrgb**](https://pymccrgb.readthedocs.io/en/latest/) for a Python interface to MCC-RGB, an extension of MCC to points with color attributes.
+
+## Reference
+
+Implements method described in
+
+Evans, J. S., & Hudak, A. T. 2007. A multiscale curvature algorithm for classifying discrete return LiDAR in forested environments. IEEE Transactions on Geoscience and Remote Sensing, 45(4), 1029-1038 [doi](https://doi.org/10.1109/TGRS.2006.890412)
+
+## MCC-lidar
+
+This package provides Cython/Python wrappers to functions in version 2.1 of `mcc-lidar`:
+
+- [mcc-lidar project](https://sourceforge.net/p/mcclidar/wiki/Home/)
+- [mcc-lidar source](https://sourceforge.net/p/mcclidar/code/HEAD/tree/tags/2.1/)