adding docker code for microservices

docker-compose.yml

microservices/admins_service/DockerFIle

microservices/admins_service/requirements.txt

microservices/bikes_service/Dockerfile

microservices/bikes_service/local_bike.db

microservices/bikes_service/main.py

microservices/bikes_service/requirements.txt

microservices/rentals_service/DockerFIle

microservices/rentals_service/rentals.db

microservices/rentals_service/requirements.txt

microservices/reviews_service/DockerFIle

microservices/reviews_service/requirements.txt

microservices/reviews_service/review.db

microservices/users_service/DockerFIle

microservices/users_service/main.py

microservices/users_service/requirements.txt