docs(TESTING): add testing doc with rafiki.money

TESTING.md

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+Before working with the Web Monetization Extension, we recommend creating a wallet account on [rafiki.money], a test wallet provider that's part of the Interledger test network.
+
+[rafiki.money] lets you create or upload developer keys and create wallet accounts, funded with test/play money, for making Interledger transactions via the Open Payments APIs.
+
+## Create an account on Rafiki.Money
+
+1. Go to [rafiki.money].
+1. Click **Create an account** at the bottom right of the screen.
+1. Enter your e-mail address, a password, confirm the password and click the arrowhead.
+1. Go to your inbox and look for an e-mail sent by `[email protected]` with the subject `[Rafiki.Money] Verify your account` and click **Confirm my email address.**
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step4.png" alt="Confirm email address" width="350" />
+
+1. Click **Login to your account** at the email verification screen.
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step5.png" alt="Log in with new account at rafiki.money" width="350" />
+
+1. Log in with your credentials.
+1. Enter any First and Last name on the Complete KYC screen and click **Get Wallet Account.** Note that since this is a test environment, the country, city and address fields will already be filled in
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step8.png" alt="Get wallet account at rafiki.money" width="350" />
+
+1. Click **Verify your identity** on the pop-up window.
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step9.png" alt="Identity verification at rafiki.money" width="350" />
+
+1. Click **Verify Account** at the Complete KYC screen. Note that since this is a test environment "Passport" will be selected as the verification method and images will be uploaded by default.
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step10.png" alt="Verify account at rafiki.money" width="350" />
+
+1. Click **Go to your account overview** on the pop-up window.
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step11.png" alt="Account overview dashboard on rafiki.money" width="350" />
+
+You're now ready to create a Rafiki.Money test wallet and add money to it!
+
+## Create a wallet account
+
+The first time you access [rafiki.money], you'll be guided through creating a new wallet account.
+
+1. If you've completed or skipped the onboarding guide, you can create a wallet account by clicking **New Account.**
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step13.png" alt="Set up new account at rafiki.money" width="300" />
+
+1. Enter a name for the account, choose an asset code from the drop-down menu and click **Create account.**
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step15.png" alt="Enter name and create account on rafiki.money" width="300" />
+
+1. Click **View Account.**
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step16.png" alt="Click to view account created on rafiki.money" width="350" />
+
+1. Click **Add money.**
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step20.png" alt="Add money to payment pointer on rafiki.money" width="400" />
+
+1. Fund your wallet by entering an amount, then click **Add money.**
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step21.png" alt="Enter amount and add money to the payment pointer on rafiki.money" width="400" />
+
+Congratulations, you now have a funded [rafiki.money] wallet!
+
+### Set up a payment pointer
+
+1. Go to the **Web Monetization** tab in selected account.
+1. Click **Add WM payment pointer.** NEEDS IMG
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step17.png" alt="Add a payment pointer for the new account on rafiki.money" width="400" />
+
+1. Enter a Payment Pointer name and a Public name and then click **Create.** NEEDS IMG
+
+   <img src="https://openpayments.dev/img/snippets/rafiki-money-step19.png" alt="Create payment pointer on rafiki.money" width="400" />
+
+## Obtain a public-private key pair and key ID
+
+Before you connect your wallet to the extension, you need to upload the public key from the extension's popup into the test wallet.
+
+1. Open the extension popup by clicking the icon in browser toolbar and copy the public key.
+1. On [rafiki.money], Select **Settings > Developer Keys**.
+1. Expand the drop-down menu for your wallet account, and then expand the desired wallet address. NEEDS IMG
+
+   <img src="https://openpayments.dev/img/snippets/generate-keys.png" alt="Expanded account showing payment pointer and upload key" width="600" />
+
+1. Click the **Upload key** button.
+1. Paste the copied public key to the input field, add a nickname for the key and click **Upload key**. NEEDS IMG
+
+   <img src="https://openpayments.dev/img/snippets/view-keys.png" alt="Expanded account showing key ID, option to show public key, and button to revoke public/private keys" height="300" />
+
+You can now open the extension popup again and connect your wallet.
+
+## Testing the extension
+
+Test out the extension in the [playground].
+
+[rafiki.money]: https://rafiki.money
+[playground]: https://example.com/todo