[Tagging] Feature Proposal - RFC - Carpet hanger

[Mateusz Konieczny]

carpet hanger (also carpet stand or carpet rack) is a construction to
hang carpets for cleaning with the help of carpet beaters.

Wikipedia page: https://en.wikipedia.org/wiki/Carpet_hanger 

Currently there is no documented tagging scheme for this feature. At
this moment amenity=beater is typically used, but it seems poor tag
name, not matching English name for this feature.

the proposal page:
https://wiki.openstreetmap.org/wiki/Proposed_features/carpet_hanger