update readme

Author: Ritvik Vasan

README.md

@@ -13,5 +13,15 @@ pip install "git+https://github.com/erikwijmans/Pointnet2_PyTorch.git#egg=pointn
 pip install --upgrade https://github.com/unlimblue/KNN_CUDA/releases/download/0.2/KNN_CUDA-0.2-py3-none-any.whl
 ```
 
+To use
+ 
+```bash
+
+from im2mesh.utils.libmise.mise import MISE
+from im2mesh.utils.libmcubes import marching_cubes
+```
+
+install the occupancy networks repo and build these 2 extensions
+
 **Allen Institute Software License**