added logo

Author: Roland Schuller

README.md

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 # Mapillary Java API
 
-![Image](https://github.com/it-open/mapillary-api/raw/master/doc/graphics.png)
+![Image](https://github.com/it-open/mapillary-api/raw/master/doc/logo.svg)
 
 Mapillay API as Java Library see https://www.mapillary.com/developer/api-documentation/
 This Project should wrap the complete API with Java Functions and Objects.