changed readme

README.md

@@ -42,3 +42,9 @@ Mouse wheel scroll to zoom dynamically.
 Left-click on the background to drag the map around.  
 
 To save the setup as .gse file, press s. The program will automatically load the save file on startup. It is located in the sketches data folder. Back it up now and then ~.  
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+Todo:
+- Add intuitive method to change background image  
+- Render out .html file