Added Readme

README.md

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 # GPXtoCNXConverter
+
+This is a Python script for converting .GPX files to .CNX files. It allows you to export your tracks and waypoints (POIs). The script supports bulk conversion of multiple .GPX files.
+
+* CNX is a GIS data file format used by iGPSPORT GPS sport devices.
+* GPX is an XML based format for GPS tracks.
+
+## Data
+
+The script exports the following GPX data to the CNX file:
+
+Track name from GPX tags.
+    
+Trackpoints:
+* Latitude
+* Longitude
+* Elevation
+    
+Waypoints (POIs):
+* Latitude
+* Longitude
+* Name
+
+The script also calculates the following data based on the coordinates (features of the format and devices where it is used):
+
+* Distance
+* Ascent
+* Descent
+* Trackpoint count
+* Waypoint count
+
+## Usage
+
+Run the gnx2cnx.py script or gnx2cnx.exe (from the release) to start the GUI. Browse and open your files. The converted files will be placed in the same directory as the original files, in a subfolder called 'cnx_routes'.
+
+## Features
+
+Converted files have names like 'route_original_file_name'. The part 'original_file_name' is truncated to 18 characters for better compatibility with bike computers.
+
+
+