Add documentation for golang select statement (#2219)

* Add documentation for golang select statement

* Update content/roadmaps/109-golang/content/101-go-advanced/108-select.md

Co-authored-by: alexander <alexander@fedora.(none)>
Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/109-golang/content/101-go-advanced/108-select.md

@@ -1 +1,7 @@
-# Select
+# Select
+
+The `select` statement is similar to a `case` statement, but is primarily used for handling reading from multiple channels.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://gobyexample.com/select'>Go by Example: Select</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://golangdocs.com/select-statement-in-golang'>Select Statement in Go</BadgeLink>