docs(customer-payment): update installation docs in overview (#3082)

Author: xelaint

libs/customer-payment/README.md

@@ -1,9 +1,16 @@
 # @daffodil/customer-payment
-
 `@daffodil/customer-payment` contains the main features required to support customer management in an Angular app. It supports loading a customer and saved payments.
 
 ## Installation
+To install `@daffodil/customer-payment`, use the following commands in your terminal.
 
-```
+Install with npm:
+```bash
 npm install @daffodil/customer-payment --save
 ```
+
+Install with yarn:
+
+```bash
+yarn add @daffodil/customer-payment
+```