Encourage developers to hand-pick the selection of wallets most appropriate for their audience

[steveluscher]

Problem

As third-party wallet offerings evolve, our starter apps continue to put forth a starter list of wallets that does not. Besides going stale over time, the decision of which wallets a dApp should support is not a responsibility of wallet-adapter itself; ultimately, the decision of which wallets to support rests with the dApp publisher themselves.

Summary of changes

• Create a FakeWalletAdapter that conforms to the wallet adapter interface, but otherwise offers no useful signing/sending services.
• Include FakeWalletAdapter in all of the starter packs, along with instructions on where to find real wallet adapters.

Test plan

1. yarn && yarn build
2. cd packages/starter/example && yarn dev
3. Open https://localhost:3000

Screen.Recording.2022-08-02.at.3.33.53.PM.mov

1. yarn && yarn build
2. cd packages/starter/react-ui-starter && yarn start
3. Open https://localhost:1234

Screen.Recording.2022-08-02.at.3.43.29.PM.mov

Observe warning on the developer console that links to this document.

[jordaaash]

LGTM!