Using composer to create project base files

Hi, I saw some examples of people using a .MD file that explains the structure, the files, and what is needed in each file, and composer starts creating a base.
I tried some times adding a project.MD file to root project and starting composer to follow the instructions but each time is a crazy mesh.

Can point me out how to use this feature?
I create the project folder, in this case, is a next.js app and copy the .MD into the root folder.

What I’m doing wrong?

just ask it to create files - it starts making new files without me providing it with anything else than a prompt, I just tried and seems to work.

by the way are we supposed to iterate with short sessions and open new ‘composers’ in the sidebar after 4-5 iterations, or it’s better to keep everything in a very long thread that keeps editing same files over and over? what is the best approach?