Add placeholder blurb to Concept Exercise .meta/config.json files
Add placeholder blurb to Concept Exercise .meta/config.json files

Each Concept Exercise will have to define a blurb, which is a short description of the exercise.
The blurb will be displayed on a track's exercises page (e.g. https://exercism.lol/tracks/csharp/exercises).

This commit adds a placeholder blurb to the .meta/config.json file of each Concept Exercise.

See [the spec](https://github.com/exercism/docs/blob/main/anatomy/tracks/concept-exercises.md#file-metaconfigjson) for more information.

exercism/xcpp,patricksjackson/xcpp,patricksjackson/xcpp,exercism/xcpp