Added Dockerfile

Dockerfile

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+FROM ubuntu:latest
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+COPY . .
+
+RUN apt update && \
+  apt install python3-pip python-is-python3 -y && \
+  pip install -r requirements.txt
+
+# Run ./sublist3r plus arguments passed by docker run
+ENTRYPOINT ["python3", "sublist3r.py"]