Added docker support

Dockerfile

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+FROM python:3.7-slim
+ADD . /code
+WORKDIR /code
+RUN pip install -r requirements.txt
+CMD ["python", "run.py"]

docker-compose.yml

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+version: '3'
+services:
+  web:
+    build: .
+    ports:
+    - "8888:8888"

run.py

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+from webssh.main import main
+
+
+if __name__ == '__main__':
+    main()