Start translation to brazilian portuguese

pt-br/code/src/apps/ch.2.7/timeout/main.go

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+// Example code for Chapter 2.7 from "Build Web Application with Golang"
+// Purpose: Shows how to create and use a timeout
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+
+func main() {
+	c := make(chan int)
+	o := make(chan bool)
+	go func() {
+		for {
+			select {
+			case v := <-c:
+				fmt.Println(v)
+			case <-time.After(5 * time.Second):
+				fmt.Println("timeout")
+				o <- true
+				break
+			}
+		}
+	}()
+	<-o
+}