Merge branch 'master' of https://github.com/johnA1331/tutorials into johnA1331-master

# Conflicts:
#	algorithms-miscellaneous-4/README.md
#	algorithms-sorting/README.md
#	gradle-5/README.md
#	java-dates-2/README.md
#	jaxb/README.md
#	jersey/README.md
#	libraries-primitive/README.MD
#	mapstruct/README.md
#	metrics/README.md
#	ml/README.md
#	persistence-modules/sirix/README.md
#	spring-5-data-reactive/README.md
#	spring-5/README.md
#	spring-boot-autoconfiguration/README.md
#	spring-freemarker/README.md
#	spring-mvc-simple-2/README.md
#	spring-mvc-xml/README.md
#	spring-thymeleaf-2/README.md
#	testing-modules/junit-5-advanced/README.md
#	xml/README.md

jhipster-5/README.md

@@ -1,3 +1,6 @@
 ## JHipster 5
 
 This module contains articles about JHipster 5. This is an aggregator module, articles are in the relevant submodules.
+
+### Relevant Articles:
+- [JHipster Authentication with an External Service](https://www.baeldung.com/jhipster-authentication-external-service)