Report highway=mini_roundabout in instructions

Hi,

The tag **highway=mini_roundabout** is used to mark a roundabout which has a traversable island (see https://wiki.openstreetmap.org/wiki/Tag:highway%3Dmini_roundabout )

In some countries, the rules are like this:
The island **can** be traversed by **big-sized vehicles**, when they need the space. But the island is **not allowed to be traversed** by all vehicles which are small and don't need the space.

Maybe in other countries the traffic rules for these "roundabouts" are different?

So in conclusion, we see an osm mini_roundbaout still as a **roundabout** here in germany. I don't know whether this might be different in other countries, maybe experience from other users/countries would help here.

So the problem is now, that for highway=mini_roundabout, the roundabout instructions are missing in GraphHopper. The instruction is only "turn right" for example, but in Germany we would expect something like "take the first exit/take exit number 1".

Of course, I can tell this only for my local experience in Germany here. Maybe this was also discussed somewhere, but for GraphHopper issues I didn't find it, so I opened up this.