Create Dockerfile

there is Dockerfile in other examples. this docker file assumes that there is a .env file(i added env.example in another pull request)

examples/websocket-server/Dockerfile

@@ -0,0 +1,15 @@
+FROM python:3.10-bullseye
+
+RUN mkdir /app
+
+COPY *.py /app/
+COPY requirements.txt /app/
+COPY .env /app/
+
+WORKDIR /app
+
+RUN pip3 install -r requirements.txt
+
+EXPOSE 7860
+
+CMD ["python3", "bot.py"]