Update README.md

Author: thomaswoehlke

README.md

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 # learn-springboot-reactive-stack
 learn-springboot-reactive-stack
+
+# First Infos:
+* [Reactive Microservices With Spring Boot(]https://spring.io/reactive)
+* [Spring WebFlux](https://docs.spring.io/spring/docs/current/spring-framework-reference/web-reactive.html)
+* [Guide to Spring 5 WebFlux](https://www.baeldung.com/spring-webflux)
+* [Leitfaden Spring WebFlux](https://www.codeflow.site/de/article/spring-webflux)
+* [Spring WebFlux Tutorial](https://howtodoinjava.com/spring-webflux/spring-webflux-tutorial/)
+* [Migrating a microservice to Spring WebFlux](https://allegro.tech/2019/07/migrating-microservice-to-spring-webflux.html)
+* [Seminararbeit: Reactive Web Backends mit Spring WebFlux](https://tschutschu.de/resources/tschutschu/docs/SS2019/SS2019_T09_Fuchs_Michael_Studienarbeit.pdf)