React Simple Invoice Generator

I don't know react or npm or yarn. There are lots of warnings and errors.

This is how I get it running:

1. npm install --force
2. yarn start
3. Open browser at: http://localhost:3000

Known bugs

• The paymentInfo fields are not passed through at start up from the initial invoice data
• The items from the initial invoice data are not displayed (but I think they are present in the state)
• There is no way to reset the page back to the initial invoice data