Update README.md

README.md

 # Benchmark_nnU-Net_for_PyTorch
 Benchmark of nnU-Net for PyTorch on Berzelius
 
-## Clone the repository.
+### On local
+- Clone the repository.  
+```
 git clone https://github.com/NVIDIA/DeepLearningExamples
 cd ngc/DeepLearningExamples/PyTorch/Segmentation/nnUNet
+```
 
-## Build the nnU-Net PyTorch NGC container.
+- Build the nnU-Net PyTorch NGC container.
+```
 docker build -t nnunet .
+```
+
+- Push the container to Docker Hub
+```
+docker tag nnunet:latest xuagu37/nvidia_nnu-net_for_pytorch:21.11.0
+docker push xuagu37/nvidia_nnu-net_for_pytorch:21.11.0
+```
+
+### On Berzelius
+
+- Clone the repository.  
+```
+git clone https://github.com/NVIDIA/DeepLearningExamples
+cd ngc/DeepLearningExamples/PyTorch/Segmentation/nnUNet
+```
+
+- On Berzelius, pull the image for Singularity and run
+```
+singularity pull nvidia_nnu-net_for_pytorch.sif docker://xuagu37/nvidia_nnu-net_for_pytorch:21.11.0
+singularity shell -B ${PWD}/data:/data -B ${PWD}/results:/results --nv nvidia_nnu-net_for_pytorch.sif 
+```