add taginfo file to let OSMers know which tags are used

[nlehuby]

Description:

Taginfo is a very useful project to learn about tags in OSM, and you can use it to know what the tags are used to.

We should create a taginfo project file with the tags we use (at least for the Jungle Bus app, I'm not sure this is very relevant for OSM Contributor 🤔).

The documentation for the file format can be found here : https://wiki.openstreetmap.org/wiki/Taginfo/Projects