User remarks about Get Started

[JeromeGalan]

Here are some remarks of users for GET STARTED doc & coding parts:

[TODO]

• Vscode : In the problem tab, there are several errors (for example "include" directory is not found). Theses errors are not real errors, but some users think there are problems with the get started project.

[WILL NOT BE CORRECTED]

• [NO] Sometimes, a user doesn't manage to build the project : maybe the user have not followed the tutorial, or arduino platformio project sometimes crashes.
  Anyway, we should add a warning in the get started to suggest to delete the .pio directory.

• [NO] For Arduino users, you have to select the board you use on the platformio.ini file by modifying the board zero line. Users sometimes are confused by "zero" and "mkrzero". We should add a warning about that.

[JeromeGalan]

separate.
2nd to put in low prio

[JeromeGalan]

Done in 2.6.0