For installation: npm install
For starting: npm start
Will run on localhost:3000
No preprocessor .less used as node-less-chokidar is soo slow on development - and anyway is preparing CSS file - webpack has better solutions for that but project runs on react-scripts so no configuration for that.
Password do not accept special characters only as requested exactly 8 characters, at least one small letter, at least one capital letter, at least one number.
Some polishing is necessary but hope is just for challange - can explain more in person.