[React] wanted_pre_onboarding(March)

https://www.wanted.co.kr/events/pre_challenge_fe_7frontend challenge (3/6 - 4/16)pre-assignment: https://github.com/jamie7dev/wanted-pre-onb

components: common JS filespages: routesnpm install react-router-dom(index.js)(app.js)(router.js)(Layout.js)<Outlet />을 컴포넌트를 보여주고자 하는 자리에 넣기react-

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(Header.js)(Sidebar.js)