docs: add description of circuit breaker support

Author: jbl428

README.md

@@ -18,6 +18,7 @@ This library is inspired by the HTTP interface in Spring 6 and provides a simila
 - Offers integration with [class-transformer](https://github.com/typestack/class-transformer) to facilitate data
   transformation.
 - Uses promises instead of observables
+- Circuit breaker support
 
 ## Requirements
 
@@ -113,6 +114,9 @@ class UserService {
 - `@RequestForm(key?: string, defaultValue?: string)`: Specifies the request form
   using `application/x-www-form-urlencoded` as the content type, requiring the key of the body optionally.
 
+- `@CircuitBreaker(options?: CircuitBreaker.Options)`: Marks the method as a circuit breaker, with `options` being the
+  options of the circuit breaker. You can use global options by setting the `circuitBreakerOption` property in the module.
+
 ## Auto generate `@ResponseBody()` from return type of exchange method
 
 Because of limitation of `reflect-metadata`, `@ResponseBody()` is required to specify the response DTO.