Updated docs for Stub Runner Spring Cloud

fixes #264

stub-runner/stub-runner-spring-cloud/README.adoc

@@ -9,6 +9,17 @@ io.codearte.accurest:stub-runner-spring-cloud
 
 and the Stub Runner autoconfiguration should be picked up.
 
+==== Stubbing Service Discovery
+
+The most important feature of `Stub Runner Spring Cloud` is the fact that it's stubbing
+
+- `DiscoveryClient`
+- `Ribbon` `ServerList`
+
+that means that regardles of the fact whether you're using Zookeeper, Consul, Eureka or anything else, you don't need that in your tests.
+We're starting WireMock instances of your dependencies and we're telling your application whenever you're using `Feign`, load balanced `RestTemplate`
+or `DiscoveryClient` directly, to call those stubbed servers instead of calling the real Service Discovery tool.
+
 ==== Additional Configuration
 
 You can match the artifactId of the stub with the name of your app by using the `stubrunner.stubs.idsToServiceIds:` map.