major update

README.md

package-lock.json

package.json

public/index.html

src/About.js

src/App.css

src/App.js

src/App.test.js

src/Background.js

src/Home.js

src/Routes.js

src/assets/avatar.svg

src/assets/favicon.ico

src/assets/hello.svg

src/assets/logo.png

src/assets/screenshot.PNG

src/components/Countdown/Timer.css

src/components/Countdown/Timer.js

src/components/Optin/Optin.css

src/components/Optin/Optin.js