Basic 'Vite + React + Motoko' counter example

[rvanasa]

It works!

Next steps (for the demo):

• [ ] Show Motoko error messages in frontend
• [ ] Add a customizable artificial delay (it's way too good to be true right now)
• [ ] Switch from using dev server to replica on build

Next steps (in general):

• [ ] Transcode JS values to/from Motoko values
• [ ] Extract the frontend wrapper into an npm package
• [ ] Add isomorphic agent-js wrapper
• [ ] Simulate read-only behavior of query functions
• [ ] Write a basic setup and usage tutorial