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Merge pull request #107 from nats-io/ngs-python-docker

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# Getting started with Python and NGS running in Docker
Start a lightweight Docker container:
```
docker run --entrypoint /bin/bash -it python:3.8-slim-buster
```
Or you can also mount local creds via a volume:
```
docker run --entrypoint /bin/bash -v $HOME/.nkeys/creds/synadia/NGS/:/creds -it python:3.8-slim-buster
```
Install nats.py and dependencies to install nkeys:
```
apt-get update && apt-get install -y build-essential curl
pip install asyncio-nats-client[nkeys]
```
Get the Python examples using curl:
```
curl -o nats-pub.py -O -L https://raw.githubusercontent.com/nats-io/nats.py/master/examples/nats-pub/__main__.py
curl -o nats-sub.py -O -L https://raw.githubusercontent.com/nats-io/nats.py/master/examples/nats-sub/__main__.py
```
Create a subscription that lingers:
```
python nats-sub.py --creds /creds/NGS.creds -s tls://connect.ngs.global:4222 hello &
```
Publish a message:
```
python nats-pub.py --creds /creds/NGS.creds -s tls://connect.ngs.global:4222 hello -d world
```