Add library browser feature

Dockerfile

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+# set base image (host OS)
+FROM python:3.13.5-slim-bookworm
+
+# set the working directory in the container
+WORKDIR /app
+
+# copy the dependencies file to the working directory
+COPY requirements.txt .
+
+# install dependencies
+RUN pip install --upgrade pip
+RUN pip install -r requirements.txt
+
+# copy the content of the local src directory to the working directory
+COPY . .
+
+EXPOSE 5000
+
+# add healthcheck using Python standard library
+HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
+  CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:5000/health').read()"
+
+# command to run on container start
+CMD [ "python", "/app/offlineu_core.py" ]