update README.md

Author: hantsy

README.md

@@ -1,12 +1,12 @@
-# RSocket sandbox
+# RSocket Sandbox
 
 Sample codes of RSocket Java  and Spring RSocket integration.
 
 ## Docs
 
 [Using Rsocket with Spring Boot](https://medium.com/@hantsy/using-rsocket-with-spring-boot-cfc67924d06a)
 
-## Source Codes
+## Related Codes
 
 * **vanilla**  rsocket-java sample
 * **tcp** Spring Boot based application using TCP protocol transport between client and server 
@@ -15,7 +15,19 @@ Sample codes of RSocket Java  and Spring RSocket integration.
 * **server-requester**  Sending message  to client via Server `RSocketRequster`.
 * **integration**  Spring Integration RSocket inbound and outbound gateway.
 
+## References
 
+* [Spring Framework Reference](https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/web-reactive.html#rsocket)
+* [Spring Secuirty Reference](https://docs.spring.io/spring-security/site/docs/current/reference/html/rsocket.html)
+* [Spring Boot Reference](https://docs.spring.io/spring-boot/docs/2.2.4.RELEASE/reference/htmlsingle/#boot-features-rsocket)
+* [Spring Integration Reference](https://docs.spring.io/spring-integration/reference/html/rsocket.html)
+* [RSocket Using Spring Boot](https://www.baeldung.com/spring-boot-rsocket) by Baeldung
+* [RSocket Messaging with Spring](https://www.youtube.com/watch?v=iSSrZoGtoSE)
+* [Reactive Architectures with RSocket and Spring Cloud Gateway](https://www.youtube.com/watch?v=PfbycN_eqhg)
+
+* [bclozel/spring-flights](https://github.com/bclozel/spring-flights)
+* [spring-projects/spring-security/tree/5.2.2.RELEASE/samples/boot/hellorsocket](https://github.com/spring-projects/spring-security/tree/5.2.2.RELEASE/samples/boot/hellorsocket)
+* [spencergibb/rsocket-routing-sample](https://github.com/spencergibb/rsocket-routing-sample)