Add react bootstrap to project

.gitignore

frontend/README.md

frontend/package.json

frontend/public/favicon.ico

frontend/public/index.html

frontend/public/logo192.png

frontend/public/logo512.png

frontend/public/manifest.json

frontend/public/robots.txt

frontend/src/App.test.tsx

frontend/src/App.tsx

frontend/src/index.css

frontend/src/index.tsx

frontend/src/react-app-env.d.ts

frontend/src/serviceWorker.ts

frontend/src/setupTests.ts

frontend/src/showcases/Buttons.tsx

frontend/src/showcases/Toasts.tsx

frontend/tsconfig.json

frontend/yarn.lock