Updated documentation

README.md

@@ -46,6 +46,12 @@ As an example:
 
 > POLYGON((9.176194 48.779168, 9.171473 48.775265, 9.176923 48.772890, 9.179842 48.774474, 9.181043 48.774134, 9.183103 48.775661, 9.182073 48.776962, 9.176194 48.779168))
 
+### Import a polygon
+
+If no polygon has been drawn yet, "WKT Polygon" input field can be used. Simply copy a [WKT](https://en.wikipedia.org/wiki/Well-known_text_representation_of_geometry) polygon into the field, click on `Import Polygon`, and the geometry should be imported into RegionChooser.
+
+With this feature, it should be easy to share geometry between users.
+
 ## Command-line
 
 RegionChooser can also be called from the command-line: