Added ReactiveSocketFactory interface

Author: rdegnan

Diff for: src/main/java/io/reactivesocket/ReactiveSocketFactory.java

@@ -0,0 +1,11 @@
+package io.reactivesocket;
+
+import org.reactivestreams.Publisher;
+
+import java.net.SocketAddress;
+import java.util.concurrent.TimeUnit;
+
+@FunctionalInterface
+public interface ReactiveSocketFactory {
+    Publisher<ReactiveSocket> call(SocketAddress address, long timeout, TimeUnit timeUnit);
+}