Suggestion for the data model specification

I think that it would be a good idea to add to that data model specification a list of friends with whom the user has shared that route.

The turtle triple could be something that links a WebId of a user with the WebId of the user with whom he wants to share the content:

```
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Start by locating the data model specification and reviewing how route-sharing relationships are currently represented. Compare the proposed WebId-to-WebId Turtle triple with the existing model, then determine whether the specification should define a friend list and what completed documentation should contain.

Written by the indexing model from the issue text.