Added reade

README.md

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+# Composable Subscriber
+
+A higher order reducer for subscribing to `AsyncStream` from your app.
+
+Any dependency that returns an `AsyncStream` can be subscribed to in the following way.
+
+```
+Reduce {
+ // your usual reducer here
+}
+.subscribe(on: \.some.trigger.action, to: myDependency.strem, with: \.some.response.action)
+``` 
+
+There is a requirement that the AsyncStream returns the same type as the response action takes.