add project skeleton

backend-socket.io/.gitignore

backend-socket.io/package-lock.json

backend-socket.io/package.json

backend-socket.io/public/.gitkeep

backend-socket.io/server.js

frontend-react/.gitignore

frontend-react/package-lock.json

frontend-react/package.json

frontend-react/public/index.html

frontend-react/src/Chatbot.css

frontend-react/src/Chatbot.js

frontend-react/src/Header.css

frontend-react/src/Header.js

frontend-react/src/Message.css

frontend-react/src/Message.js

frontend-react/src/MessageArea.css

frontend-react/src/MessageArea.js

frontend-react/src/UserInput.css

frontend-react/src/UserInput.js

frontend-react/src/index.css