chore: update radme

Co-Badged Cards/README.md

@@ -12,7 +12,7 @@ To run the example app:
 git clone https://github.com/primer-io/checkout-examples-ios.git
 ```
 
-2. Change directory into the repo
+2. Change the directory into the repo
 
 ```sh
 cd "checkout-examples-ios/Co-Badged Cards/SwiftUI"
@@ -26,19 +26,22 @@ open "Co-Badged Cards Example.xcodeproj"
 
 4. Run the project from Xcode 🚀
 
+----
+
+This project requires a server to communicate with Primer's API. To get started quickly, we encourage you to use the [companion backend](https://github.com/primer-io/example-backend).
+
 ## Trying it out
 
 This example app allows you to:
 
-- Generate a client token (requires local server, see here TODO)
+- Generate a client token
 - Make a payment using a card
 - Select a co-badged network when making a payment with a co-badged card
 
 We support several test cards for different test cases, which you can find in our docs:
 
 📄 **[Primer Payments Testing](https://primer.io/docs/payments/testing)**
 
-
 ## Understanding the integration
 
 ### PrimerDataService