feat: create initial skeleton for dapp-agoric-basics

[LuqiPan]

references: Agoric/documentation#938

Summary

This PR creates the minimal skeleton for dapp-agoric-basics, including rudimentary CI.

This PR does not contain any UI code as I'm planning to use ui-kit and hoping to follow docs produced as part of Agoric/documentation#922

Testing

On my local machine:

• yarn lint

  
  yarn lint
  yarn run v1.22.21
  $ yarn workspaces run lint

agoric-basics-contract $ eslint '*/.js' ✨ Done in 1.27s.

• yarn test

  
  yarn test
  yarn run v1.22.21
  $ yarn workspaces run test

agoric-basics-contract $ ava --verbose

✔ contract greets by name ─

1 test passed ✨ Done in 0.65s.

[LuqiPan]

Closing this as we decided to use dapp-offer-up as the baseline