[Imports] RFC for City of Basel Suburb Import

[Johannes Singler]

Hi everyone,

after discussing this on the Swiss OSM mailing list (talk-ch), I hereby 
announce the import of the suburbs of the city of Basel in Switzerland.
The one-time import is manual and comprises 19 suburbs.  It touches 
three country borders, though.

The import wiki page can be found here:
<https://wiki.openstreetmap.org/wiki/City_of_Basel_Suburb_Import>

I'm a local mapper living in the area.

Looking forward to your comments,
Johannes