* 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

libs/monitoring/__init__.py

@@ -0,0 +1,36 @@
+import queue
+from fritzconnection.core.fritzmonitor import FritzMonitor
+
+### Monitor the calls of a fritzbox continously ###
+###################################################
+
+def watch_disconnect(monitor, event_queue, func, healthcheck_interval=10):
+    while True:
+        try:
+            event = event_queue.get(timeout=healthcheck_interval)
+        except queue.Empty:
+            # check health:
+            if not monitor.is_alive:
+                raise OSError("Error: fritzmonitor connection failed")
+        else:
+            # do event processing here:
+            print(event)
+            if 'DISCONNECT' in event:
+                print("Anruf beendet. Jetzt den AB checken.\n")
+                func()
+
+
+
+def endedCall(func, fritz_ip='192.168.1.1'):
+    """ 
+    Call this to trigger a given function if a call is disconnected 
+    """
+    try:
+        # as a context manager FritzMonitor will shut down the monitor thread
+        with FritzMonitor(address=fritz_ip) as monitor:
+            event_queue = monitor.start()
+            watch_disconnect(monitor, event_queue, func)
+    except (OSError, KeyboardInterrupt) as err:
+        print(err)
+
+