readme: update

README.md

@@ -35,4 +35,26 @@ MiniDApps for quick testing & prototyping in MiniPay.
     ngrok http 3000
     ```
 
-7. Open the Site Tester dApp inside MiniPay and use the static url or the url you get from ngrok!
+### How to test your DApp in MiniPay
+
+1. Open the MiniPay app on your phone and click on compass icon.
+
+    ![minipay-app](https://github.com/celo-org/docs/blob/0712d6ec3231bd7d64a906d610a16deb1e6b037e/static/img/doc-images/minipay/minipay-1.png?raw=true)
+
+2. Click on "Test Page" to open the MiniPay test page.
+
+    ![minipay-apps-screen](https://github.com/celo-org/docs/blob/0712d6ec3231bd7d64a906d610a16deb1e6b037e/static/img/doc-images/minipay/minipay-2.png?raw=true)
+
+3. Enter the URL of your DApp and click on "Go".
+
+    ![minipay-site-tester](https://github.com/celo-org/docs/blob/0712d6ec3231bd7d64a906d610a16deb1e6b037e/static/img/doc-images/minipay/minipay-3.png?raw=true)
+
+### Important Notes
+
+-   Ensure the "Connect Wallet" button is hidden when your DApp is loaded inside the MiniPay app, as the wallet connection is implicit.
+-   Always verify the existence of `window.provider` before initializing your web3 library to ensure seamless compatibility with the MiniPay wallet.
+-   Be cautious about exposing sensitive information or functionality when using public tunneling services like ngrok. Always use them in a controlled environment.
+-   MiniPay currently supports setting the `feeCurrency` property when running `eth_sendTransaction`. However, currency support is limited to `cUSD`. More currencies might be supported in future.
+-   MiniPay only accepts legacy transactions at the moment. EIP-1559 properties won't be considered when handling requests.
+-   Message signing is not currently supported.
+-   A developer mode will be available soon, allowing the use of testnet.