* Added docker folder to repo

* Ubuntu based docker file can be build from the repo's root by
   ```
   docker-compose -f docker/docker-compose.yml build
   ```
   * and started by
   ```
   docker-compose -f docker/docker-compose.yml build
   ```
 * Restructured code by packaging the CallMonitoring and SpeexConverting
 * main() runs on startup and then watches for disconnected calls as trigger for running again.
 * Commented main file

docker/Dockerfile

@@ -0,0 +1,35 @@
+# syntax=docker/dockerfile:1
+
+FROM ubuntu:latest
+
+ENV TZ=Europe/Berlin
+RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
+
+WORKDIR /app
+VOLUME /app
+
+COPY . .
+
+RUN ls -la
+RUN ["cat", "/app/requirements.txt"]
+
+RUN /bin/bash -c 'apt update && apt install -y libolm-dev python3-pip ffmpeg;'
+
+
+RUN pip install update pip && pip install -r requirements.txt
+
+
+CMD python3 fritzab2matrix.py && tail -f /dev/null
+
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