Update README.md with more instructions (#7)

Update readme with more instructions on how to get the keys and the information about being necessary to set an action.

README.md

@@ -13,6 +13,21 @@ To run as a mini app choose a production app in the dev portal and use NGROK to
 
 Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
 
+To use the application, you'll need to:
+
+1. **Get World ID Credentials**
+   From the [World ID Developer Portal](https://developer.worldcoin.org/):
+
+   - Create a new app to get your `APP_ID`
+   - Get `DEV_PORTAL_API_KEY` from the API Keys section
+   - Navigate to "Sign in with World ID" page to get:
+     - `WLD_CLIENT_ID`
+     - `WLD_CLIENT_SECRET`
+
+2. **Configure Action**
+   - In the Developer Portal, create an action in the "Incognito Actions" section
+   - Use the same action name in `components/Verify/index.tsx`
+
 View docs: [Docs](https://docs.world.org/)
 
 [Developer Portal](https://developer.worldcoin.org/)