Update 100-go.md (#993)

- added a one liner explaining what Go does
- added the Go resources listed on the go.dev website

content/roadmaps/101-backend/content/103-learn-a-language/100-go.md

@@ -1 +1,8 @@
-# Go
+# Go
+
+Go is an open source programming language supported by Google. Go can be used to write cloud services, CLI tools, used for API development, and much more.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink badgeText='Read' colorScheme="yellow" href='https://go.dev/tour/welcome/1'>A Tour of Go – Go Basics</BadgeLink>
+<BadgeLink badgeText='Read' colorScheme="yellow" href='https://go.dev/doc/'>Go Reference Documentation</BadgeLink>
+<BadgeLink badgeText='Read' colorScheme="yellow" href='https://gobyexample.com/'>Go by Example - annotated example programs</BadgeLink>