added notes and dockerfile for pynode

linux/docker nvidia.md

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+3. Setup NVIDIA Container Toolkit:
+Add the NVIDIA GPG key:
+
+bash
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+curl -s -L https://nvidia.github.io/nvidia-docker/gpgkey | sudo apt-key add -
+Add the NVIDIA Docker repository:
+
+For distributions based on Ubuntu 18.04 and later:
+
+bash
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+distribution=$(. /etc/os-release;echo $ID$VERSION_ID)
+curl -s -L https://nvidia.github.io/nvidia-docker/$distribution/nvidia-docker.list | sudo tee /etc/apt/sources.list.d/nvidia-docker.list
+Install the NVIDIA Docker toolkit:
+
+bash
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+sudo apt-get update
+sudo apt-get install -y nvidia-docker2
+Restart Docker:
+
+bash
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+sudo systemctl restart docker