lean into examples

examples/goroutines/goroutines.go

@@ -0,0 +1,15 @@
+package main
+
+import "fmt"
+
+func f(n int) {
+    for i := 0; i < 10; i++ {
+        fmt.Println(n, ":", i)
+    }
+}
+
+func main() {
+    go f(0)
+    var input string
+    fmt.Scanln(&input)
+}