- refactoring to the current addon specification

- usage documentation

doc/usage.md

@@ -0,0 +1,50 @@
+
+# Add-on usage
+
+![alt quickmenu](screens/vfr_overview2.png "Overview")
+
+# General interface
+
+![alt quickmenu](screens/vfr_mainmenu.png "Main menu ")
+
+![alt quickmenu](screens/vfr_quickmenu.png "Quick Menu")
+
+* **MP** - Small Map
+* **PL** - Flight Plan
+* **SW** - Stopwatch
+* **R** - Radio interface
+* **A** - ATC in range
+* **RM** - Route Manager
+* **X** -
+
+* MP - map - small map in lower left corner with route navigation, access to configuration (config button), zoom settings (buttons +/-) and quick action center on the aircraft (C button). On the bottom you can see information about current waypoint name, bearing (B), distance (D), ETA and wind direction/speed (W).
+* PL - flightplan - in upper left corner
+* SW - stopwatch
+* R - radio panel
+* A - ATC in ranges search
+* RM - route manager activation
+
+
+# Small map
+
+![alt quickmenu](screens/vfr_smallmap.png "Small map")
+
+
+**Waypoint | Bearing | Distance | ETA | Wind DIRECTION/STRENGHT**
+
+
+* **CONFIG** -
+* **-/+** -
+* **C** -
+* **X** -
+
+![alt quickmenu](screens/vfr_smallmap_settings.png "Small map - settings")
+
+# Flightplan
+
+![alt quickmenu](screens/vfr_flightplan.png "Flight plan")
+
+# Stopwatch/Radio Interface/ATC in Range/Route Manager
+
+
+# Support/Development