add init script for useing BOSWatch as a daemon

see service/README.md for details

service/README.md

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+### Start BOSWatch as a daemon
+
+## Changing the init script
+
+Lines 14 and 15 define where to find the Python script. 
+In this case the script expects that there is a folder `/usr/local/bin/BOSWatch` and that the script is inside there. 
+
+Line 23 sets what user to run the script as. Using root is generally not a good idea but might be necessary for BOSWatch.
+
+Line 19 sets the parameters for BOSWatch, use the same as starting BOSWatch from the shell.
+We recommend to use "-u" and "-q" when you want to run BOSWatch as a daemon.
+- "-u": You will find the logfiles in `/var/log/BOSWatch`
+- "-q": Shows no information. Only logfiles
+
+## Using the init script
+
+To actually use this script, put your Python script where you want (recommend `/usr/local/bin/BOSWatch`) 
+and make sure it is executable (e.g. `sudo chmod 755 boswatch.py`)
+Edit the init script accordingly. Copy the init script into /etc/init.d using e.g. `sudo cp boswatch.sh /etc/init.d`. 
+Make sure the script is executable (chmod again) and make sure that it has UNIX line-endings. 
+
+At this point you should be able to start your Python script using the command `sudo /etc/init.d/boswatch.sh start`, 
+check its status with the `sudo /etc/init.d/boswatch.sh status` argument and stop it with `sudo /etc/init.d/boswatch.sh stop`.
+
+To make the Raspberry Pi use your init script at the right time, one more step is required: 
+Running the command `sudo update-rc.d boswatch.sh defaults`. 
+This command adds in symbolic links to the `/etc/rc.x` directories so that the init script is run at the default times. 
+You can see these links if you do ls -l /etc/rc?.d/*myservice.sh

service/boswatch.sh

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+#!/bin/sh
+
+### BEGIN INIT INFO
+# Provides:          BOSWatch
+# Required-Start:    $remote_fs $syslog
+# Required-Stop:     $remote_fs $syslog
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: Python Service to receive and decode German BOS Information with rtl_fm and multimon-NG
+# Description:       Python Service to receive and decode German BOS Information with rtl_fm and multimon-NG
+### END INIT INFO
+
+# Change the next 3 lines to suit where you install your script and what you want to call it
+DIR=/usr/local/bin/BOSWatch
+DAEMON=$DIR/boswatch.py
+DAEMON_NAME=boswatch
+
+# Add any command line options for your daemon here
+DAEMON_OPTS="-f xxx -a yyy -s zz -u -q"
+
+# This next line determines what user the script runs as.
+# Root generally not recommended but necessary if you are using the Raspberry Pi GPIO from Python.
+DAEMON_USER=root
+
+# The process ID of the script when it runs is stored here:
+PIDFILE=/var/run/$DAEMON_NAME.pid
+
+. /lib/lsb/init-functions
+
+do_start () {
+    log_daemon_msg "Starting system $DAEMON_NAME daemon"
+    start-stop-daemon --start --background --pidfile $PIDFILE --make-pidfile --user $DAEMON_USER --chuid $DAEMON_USER --startas $DAEMON -- $DAEMON_OPTS
+    log_end_msg $?
+}
+do_stop () {
+    log_daemon_msg "Stopping system $DAEMON_NAME daemon"
+    start-stop-daemon --stop --pidfile $PIDFILE --retry 10
+    log_end_msg $?
+}
+
+case "$1" in
+
+    start|stop)
+        do_${1}
+        ;;
+
+    restart|reload|force-reload)
+        do_stop
+        do_start
+        ;;
+
+    status)
+        status_of_proc "$DAEMON_NAME" "$DAEMON" && exit 0 || exit $?
+        ;;
+
+    *)
+        echo "Usage: /etc/init.d/$DAEMON_NAME {start|stop|restart|status}"
+        exit 1
+        ;;
+
+esac
+exit 0