Update README.md

Merge pull request #84 from fac29/clean-json

Merge pull request #83 from fac29/update-readme

clean json

deleted erroneous json

please work

Merge pull request #81 from fac29/handling_bad_post_requests

fixed categories

added more validation on category and difficulty

Merge pull request #82 from fac29/install_prettier

Updated API endpoints

Installed prettier for common style

changed the post handler so that the request body MUST include question, options and answers AT LEAST

Merge pull request #79 from fac29/Create_2_servers

Merge branch 'Create_2_servers' of https://github.com/fac29/P1DAAF into Create_2_servers