Update README.md

ADD: in requirements: python-dotenv for accessing env

ADD: tests for authentication

ADD: authentication in main

ADD: wsgi loading env

DEL: unnecessary hint about port

ADD: env for authentication, included in .gitignore

ADD: flask-httpauth to requirements for authentication

FIX: corrected command for starting gunicorn server

FIX: relative import of module

CHG: Dockerfile calling run.sh to execute tests

ADD: run.sh that gets called by Dockerfile, runs tests and starts the app

ADD: pytest to requirements

CHG: adapted port in Dockerfile

DEL: comment

ADD: docker files

ADD: .gitignore

ADD: requirements

CHG: more general description of space

ADD: access point for backend

ADD: tests for backend files

ADD: backend files

initial commit