created microservices for all functionality

microservices/admins_service/admin.py

microservices/admins_service/bikes.db

microservices/admins_service/main.py

microservices/admins_service/requirements.txt

microservices/bikes_service/bikes.db

microservices/bikes_service/bikes.py

microservices/bikes_service/main.py

microservices/bikes_service/requirements.txt

microservices/rentals_service/main.py

microservices/rentals_service/rentals.db

microservices/rentals_service/rentals.py

microservices/rentals_service/requirements.txt

microservices/reviews_service/main.py

microservices/reviews_service/requirements.txt

microservices/reviews_service/review.db

microservices/reviews_service/reviews.py

microservices/users_service/main.py

microservices/users_service/requirements.txt

microservices/users_service/users.db

microservices/users_service/users.py