feat: add simple react frontend

[stringhandler]

Description

Creates an example react front end that starts mining

Motivation and Context

At some point we can put the old UI back

How Has This Been Tested?

First compile the react

cd ui
cd react2

Then build with npm

npm install
npm run build

Then run the back end

cargo run --bin tari_bus_tauri

You must click the Connect button first, then you can click on the others to start mining.
There's only simple feedback at the moment, so I run Docker Desktop to see whether the containers have started