Added Nvidia_smi compose and readme

docker-compose/prometheus/exporters/Nvidia_smi_exporter/README.md

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+# Prerequisite
+
+    NVIDIA container toolkit
+        sudo apt -y install build-essential nvidia-cuda-toolkit nvidia-headless-495 nvidia-utils-495 libnvidia-encode-495 \
+            && distribution=$(. /etc/os-release;echo $ID$VERSION_ID) \
+            && curl -s -L https://nvidia.github.io/nvidia-docker/gpgkey | sudo apt-key add - \
+            && curl -s -L https://nvidia.github.io/nvidia-docker/$distribution/nvidia-docker.list | sudo tee /etc/apt/sources.list.d/nvidia-docker.list \
+            && sudo apt update \
+            && sudo apt -y install nvidia-container-toolkit nvidia-container-runtime nvidia-docker2 
+
+## Deployment
+
+1. Modify the prometheus configuration template  `/etc/prometheus/prometheus.yml` location.
+# Job for Nvidia SMI exporter in prometheus config file
+        - job_name: 'nvidia_smi_exporter'
+          static_configs:
+            - targets: ['nvidia_smi_exporter:9835'] # if nvidia_smi_exporter container is not on same docker network , change this line to "- targets: ['whichever ip your host is:9835']"
+
+# Additional Referfences
+[Nvidia container toolkit](https://docs.nvidia.com/datacenter/cloud-native/container-toolkit/install-guide.html#install-guide)
+[Nvidia GPU exporter Documentation](https://github.com/utkuozdemir/nvidia_gpu_exporter)
+[Official Prometheus Documentation](https://prometheus.io/docs/introduction/overview/)
+[Some grafana dashboard, not perfect, old, but configurable](https://grafana.com/grafana/dashboards/14574)

docker-compose/prometheus/exporters/Nvidia_smi_exporter/docker-compose.yml

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+---
+version: '3'
+services:
+  nvidia_smi_exporter: #To export data from nvidia-smi, needs nvidia-smi and nvidia-container-toolkit installed on host.
+    image: utkuozdemir/nvidia_gpu_exporter:0.3.0
+    container_name: nvidia_smi_exporter
+    runtime: nvidia
+    environment:
+      - NVIDIA_VISIBLE_DEVICES=all
+      - NVIDIA_DRIVER_CAPABILITIES=all
+    ports:
+      - "9835:9835"
+    volumes:
+      - /usr/bin/nvidia-smi:/usr/bin/nvidia-smi
+      - /usr/lib/x86_64-linux-gnu/libnvidia-ml.so:/usr/lib/x86_64-linux-gnu/libnvidia-ml.so
+      - /usr/lib/x86_64-linux-gnu/libnvidia-ml.so.1:/usr/lib/x86_64-linux-gnu/libnvidia-ml.so.1
+    restart: unless-stopped
+
+#Mount points for volume work on Ubuntu 20.04