chore: adding todos

next method returns false, if it is on the end of the list

fix: fix naming for Project active
feat: implement getUserByField/getUserByEmail/getProjectById
refactor: camelcase for adminPassword

email have to be unique, because it identifies a user

feat: add update for user database entry

adding .idea folder to .gitignore for each subproject, because it's only folder for IDE configuration

It only contains IDE configuration which shouldn't be in a repository

test: adding unit tests for endpoints

refactoring: simplified package structure (no servlet/tag folders needed)
documentation: added some comments to the service classes

refactor: used jersey seeOther method for redirect instead