feat: Add Sign In View Controller and Create Account View Controller

feat: Add login screen

feat: Charges can be created and run through Stripe on the backend Heroku server

make it better

working on stripe api

feat: working on cloud function

feat: Edit checkout view controller

feat: Add stripe customer in cloud function

bug fixes checkout view controller

fix: Add stripe customer bug fix

feat: Add firebase cloud functions

feat

feat

feat

feat