Add setup instructions and screenshots to README

Author: r-n-o

README.md

@@ -22,6 +22,21 @@ $ npm install
 $ npm start # Follow the instructions on screen to build to your device or a simulator
 ```
 
+To configure the demo passkey wallet you'll need the following:
+* A Turnkey organization ID: you can create one by following our [quickstart guide](https://docs.turnkey.com/getting-started/quickstart).
+* A new Turnkey API key (public/private key pair). You can generate one using [our CLI](https://github.com/tkhq/tkcli), or through the Turnkey dashboard dashboard
+* Turnkey's base URL: you can leave the default of `https://api.turnkey.com`.
+* A new Turnkey private key ID: head to "Private Keys" in your Turnkey dashboard and create a new one ("Create private key"). The "Curve type" should be "SECP256K1", and the "Asset address type" should be "ETHEREUM".
+* An account on [Infura](https://www.infura.io/) and [Etherscan](https://etherscan.io/)
+
+You'll provide this information on first app start in the settings screen:
+
+<img src="screenshots/wallet_settings.png" alt="Wallet settings" width="300px" />
+
+Upon clicking "Save" the settings are saved in your phone's keychain and  you should see your wallet address and ETH balance:
+
+ <img src="screenshots/wallet_home.png" alt="Wallet home" width="300px" />
+
 ## Technical tl;dr
 
 Turnkey API keys and other credentials are encrypted and stored in your phone's Keychain: https://github.com/tkhq/demo-consumer-wallet/blob/e479ed7c0db8037e36166c6e2464ceb3d38bd848/src/turnkey/CredentialsContext.tsx#L111