Added install help for gps_tool

gps_tool/etc/default/gpsd

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+# Default settings for the gpsd init script and the hotplug wrapper.
+
+# Start the gpsd daemon automatically at boot time
+START_DAEMON="true"
+
+# Use USB hotplugging to add new USB devices automatically to the daemon
+USBAUTO="true"
+
+# Devices gpsd should collect to at boot time.
+# They need to be read/writeable, either by user gpsd or the group dialout.
+DEVICES="/dev/ttyACM0"
+
+# Other options you want to pass to gpsd
+GPSD_OPTIONS="-G"