update readme

Author: taigw

dense_crf_3d_python/README.md

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+# Python wrap of dense CRF for 3D image segmentation
+This package is a Python wrap of 3D fully connected (dense) CRF algorithm written in cpp.
+
+To build and install, run the following commands: 
+
+```bash
+python setup.py build
+python setup.py install
+```
+
+This will install a package named as `dense_crf3d`. See `test.py` for examples of using this package.