Document how a contrib recipe can apply a core recipe

To be clear, the way a contrib recipe requires a core recipe is...just to list it in the recipes section of recipe.yml. Core recipes are not treated any differently than any other recipe.

Akhil Babu → made their first commit to this issue’s fork.

Akhil Babu → changed the visibility of the branch 3433167-document-how-a to hidden.

I have added this in docs/recipe.md. Moving to needs review.

Merged. Thank you so much @Akhil Babu!

Automatically closed - issue fixed for 2 weeks with no activity.