Migrated Checkout screen from XML to Compose

[p42rthicle]

Migrated Checkout feature to jetpack compose (Fixes #174)

Thing to note:

• Didnt see removeItem, minusItem or plusItem callbacks being implemented anyway even in the viewmodels so those onClick Listeners in LineItemModel item is a TODO

[hieuwu]

Migrated Checkout feature to jetpack compose (Fixes #174)

Thing to note:

• Didnt see removeItem, minusItem or plusItem callbacks being implemented anyway even in the viewmodels so those onClick Listeners in LineItemModel item is a TODO

Actually In checkout screen we don't need to implement the minus, plus, click or remove. It's Ok to leave it as is Patt. Great work 👍 Thank you for your contribution

[p42rthicle]

Okay great! No problem Glad to contribute