Add a "why" blurb to each concept

[sheriffderek]

Why is the call stack important? In what situations is it most useful? When and where? Stage of career? Application?

I would find it useful to have a short and clear blurb for each in the readme.

[Nikhil562]

please assign this to me

[Puneet-Amrutkar]

can you please assign this issue to me

[Div16s]

Hello,

I'm interested in contributing to this project and would like to work on this issue. Could you please assign it to me?

Thank you! Div16s🙂