Added example with Docker and Flask (#519)

* Added example with Docker and Flask

* set flask debug flag to False

* new line at the end of file

* format with black

---------

Co-authored-by: Ricardo Sanchez Alba <r2sanchezalba@gmail.com>

examples/docker-flask/Dockerfile

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+# Use the official Python image as the base image
+FROM python:3.9-slim
+
+# Set the working directory
+WORKDIR /app
+
+# Copy the requirements file
+COPY requirements.txt .
+
+#Install the libcups library
+RUN apt-get update -y && apt-get install libcups2-dev -y
+# Install the Python packages
+RUN pip install --no-cache-dir -r requirements.txt
+RUN pip install python-escpos --pre
+
+# Install Git
+RUN apt-get update && \
+    apt-get install -y git && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy the Flask app
+COPY app.py .
+
+# Expose the port the Flask app will run on
+EXPOSE 8080
+
+# Run the Flask app
+CMD ["python", "app.py"]

examples/docker-flask/README.md

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+Simple example on how to use it inside a web service
+
+```
+docker build . -t escpos-web
+docker run --network=host -p 9999:9999 escpos
+```

examples/docker-flask/app.py

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+import escpos
+from escpos.printer import *
+from flask import Flask, jsonify, request, redirect, session, url_for
+import sys
+from io import BytesIO
+
+# Initialize Flask app
+app = Flask(__name__)
+
+
+@app.route("/", methods=["GET"])
+def do_print():
+    # p = Usb(0x04b8, 0x0e28, 0)
+    p = CupsPrinter(host="localhost", port=631, printer_name="TM-T20III")
+    p.text("Hello World\n")
+    p.cut()
+    p.close()
+    return "OK"
+
+
+if __name__ == "__main__":
+    app.run(debug=False, host="0.0.0.0", port=9999)

examples/docker-flask/requirements.txt

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+appdirs==1.4.4
+argcomplete==3.0.8
+blinker==1.6.2
+click==8.1.3
+Flask==2.3.2
+future==0.18.3
+itsdangerous==2.1.2
+Jinja2==3.1.2
+MarkupSafe==2.1.2
+Pillow==9.5.0
+pycups==2.0.1
+pypng==0.20220715.0
+pyserial==3.5
+python-barcode==0.14.0
+python-escpos==3.0a9
+pyusb==1.2.1
+PyYAML==6.0
+qrcode==7.4.2
+six==1.16.0
+typing_extensions==4.5.0
+Werkzeug==2.3.4