add english version

en/code/src/apps/ch.2.7/goroutine/main.go

@@ -0,0 +1,20 @@
+// Example code for Chapter 2.7 from "Build Web Application with Golang"
+// Purpose: Shows how to launch a simple gorountine
+package main
+
+import (
+	"fmt"
+	"runtime"
+)
+
+func say(s string) {
+	for i := 0; i < 5; i++ {
+		runtime.Gosched()
+		fmt.Println(s)
+	}
+}
+
+func main() {
+	go say("world") // create a new goroutine
+	say("hello")    // current goroutine
+}