Modularisation
- modularisation this is a method that we can use when creating an iOS app.
 - in here every feature will be create as an independent module they will have clear inputs and outputs.
 - then it will converted to a small library. each function will come as its own library
 - this video got more detail about modularisation architecture https://www.youtube.com/watch?v=QmBZ9wJguS4