Prepare a basic BDD tutorial instruction

The following discussion from !6 (merged) should be addressed:

• @adrika-novrialdi started a discussion: (+1 comment)

  • Code LGTM
  • Butuh problem specification section di README dan mandatory checklist dan challnge/additional checklist (jika ada)

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marked the checklist item @adrika-novrialdi started a discussion: (+1 comment) as completed

mentioned in merge request !8 (merged)

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closed with merge request !8 (merged)