Readme added

README.md

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 # GeoSwitch
-The description sooner or later will come up. Stay tuned!
+GeoSwitch is an Android geofencing app. Its main functionality is to execute HTTP POST request when geolocation trigger fires. 
+I use it to switch on my home IoT device when I approach to my house, hence the name - GeoSwitch.
+
+Since GPS sensor consumes battery power a lot, in addition to manual activation there is a on-charger mode designed for in-car usage when the app monitors 
+GPS data only if device is connected to charger.
+
+As supplementary functionality the app records the location history which can be exported to Google Earth or another application which handles KML format.
+The app does not sumbit location data to anywhere, it keeps the history on the device for reasonably short amount of time in log file. The app does not 
+utilize any geofencing API, it handles location data coming from GPS sensor by itself.
+
+The app verified on Android 5.0 only.
+
+Download from [here](https://github.com/vzhukovskyy/geoswitch/releases/)