services/env library

1. cofee_payment_flutter package
2. documentation
3. services/env.dart

cofee_payment_flutter package

1. Libraries
2. cofee_payment
3. cofee_payment_method_channel
4. cofee_payment_platform_interface
5. entities/payment_details_entity
6. exceptions/payment_exceptions
7. services/env
8. services/payment_details_provider
9. services/payment_service
10. views/payment_browser