add README

README.md

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+Mapbender bends a map along a path.
+
+Example execution:
+
+	./mapbender.py Weser-Radweg-Hauptroute.csv 0.286 6 20
+
+The openstreetmap map of the Weser area is currently hardcoded. Upon execution
+it will show the path given in Weser-Radweg-Hauptroute.csv on the map in a
+matplotlib plot. It will show the approximated b-spline with the given
+smoothing factor (6 above) and the map section of the given width (0.286 above)
+around that curve. The area will be split into sections (20 in the example)
+which will individually be transformed into rectangles which are also plotted.