[Tagging] River crossing grade

[Andrew Harvey]

I couldn't see anything on the wiki about river crossings grade so I
started drafting a proposal

https://wiki.openstreetmap.org/wiki/Proposed_features/Pedestrian_river_crossing

Feedback or comments or help on it is most welcome.

# Rational

Particularly on hiking trails, the intersection of a highway=footway or
highway=path and a waterway=* can be defined as either:

- A bridge bridge=yes which allows you to walk over the watercourse.
- A culvert tunnel=culvert which takes the water through a tunnel
underneath the walking path.
- Stepping stones ford=stepping_stones which allow you to walk through the
watercourse without usually getting wet (unless the water level is higher
than the stepping stones, this tag doesn't imply you'll always be able to
get across)
- A generic stream/river crossing ford=yes where your path passes through
the watercourse.
In the last case of ford=yes it can be helpful to describe the usual
condition of that stream/river crossing to help give consumers an idea of
what they can generally expect.

Mindful that conditions can change depending on upstream rainfall, or it
could vary seasonally, but for places where it's usually consistent, this
proposal proposes tagging it.

# Proposed Tagging

0. creek/stream crossing where generally the creekbed is dry and you won't
get wet.
1: creek/stream crossing where generally the water level is so low that you
won't have water ingress in your shoes
2: creek/stream crossing where your body will stay dry but you'll want to
take your shoes off if you prefer to keep them dry
3: river crossing where your body will get wet, may have a rope to help you
cross, but you can wade through the water and won't usually need to swim
4: river crossing where you'll need to swim across
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