created header, base pages, changes with routes

package-lock.json

src/components/App.js

src/components/Header.js

src/components/Main.js

src/components/pages/Home.js

src/components/pages/NotFound.js

src/components/pages/Profile.js

src/components/pages/Roster.js

src/components/pages/Schedule.js

src/components/pages/Trainers.js

src/components/pages/roster/FullRoster.js

src/components/pages/roster/Player.js