Extra docs - explaining thread Profiles.

[alainchiasson]

Looking to solve #76

I still need to:

• review my assumptions of "-int" and "-ext" being added.
• Crop the images to make them smaller.
• A better illustration for ThreadProfile.png.

I'm just looking for early feedback.

[alainchiasson]

Just noticed I branched from main and not dev. Will check and fix.

[alainchiasson]

Let me close this. Redo my branch, but from develop (not main), and redo the merge request.