Merge pull request #6 from AndriIushchuk/core-app

UserProfile model and HomeView
Design for main page
Merge pull request #8 from julia-shcherbina/master

Design for main page
Add form for create task
Merge pull request #9 from julia-shcherbina/master

Add form for create task
deleted unnecessary password, email arguments from create_user function
added succses url to HomeView
username validation