Add content to microservices node in Go roadmap (#2669)

* added content to 109-go-microservices

* Update content/roadmaps/109-golang/content/109-go-microservices/readme.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/109-golang/content/109-go-microservices/readme.md

@@ -1 +1,10 @@
-# Go microservices
+# Microservices
+
+Microservices are an architectural approach to software development that allows the creation of a distributed application from deployable services that allow communication through a well-defined API. Being a solution to monoliths.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.ibm.com/learningpaths/get-started-application-modernization/intro-microservices/introduction/'>Introduction to microservices</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://microservices.io/index.html'>Microservice Patterns and Resources by Chris Richardson</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.oreilly.com/content/microservices-antipatterns-and-pitfalls/'>Microservices AntiPatterns and Pitfalls - Mark Richards</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://samnewman.io/books/building_microservices_2nd_edition/'>Building Microservices, 2nd Edition - Sam Newman</BadgeLink>