started intermediate typescript 🔥🔥

update : using generics with interfaces

update : extending a generic

feat : finished nullish values

feat : finished type guards

feat : finished bottom and top types

feat : finished classes and access modifiers

feat : finished functions

feat : finished type exercises

feat : started intermediate typescript section

update : changed folder structure

feat : implementing interface by class

Merge branch 'main' of https://github.com/Mutesa-Cedric/learn-typescript

feat : extending interfaces

Update aliases.ts