add another tutorial

tutorial1/example.go

@@ -0,0 +1,23 @@
+package main
+
+// https://www.unbound.net/documentation/libunbound-tutorial-1.html
+
+import (
+	"fmt"
+	"github.com/miekg/unbound"
+	"log"
+)
+
+func main() {
+	u := unbound.New()
+	defer u.Destroy()
+
+	addr, err := u.LookupHost("wwww.nlnetlabs.nl")
+	if err != nil {
+		log.Fatalf("error %s\n", err.Error())
+	}
+
+	for _, a := range addr {
+		fmt.Printf("The address is %s\n", a)
+	}
+}

tutorial2/example.go

@@ -6,26 +6,23 @@ import (
 	"fmt"
 	"github.com/miekg/dns"
 	"github.com/miekg/unbound"
-	"os"
+	"log"
 )
 
 func main() {
 	u := unbound.New()
 	defer u.Destroy()
 
 	if err := u.ResolvConf("/etc/resolv.conf"); err != nil {
-		fmt.Printf("error %s\n", err.Error())
-		os.Exit(1)
+		log.Fatalf("error %s\n", err.Error())
 	}
 
 	if err := u.Hosts("/etc/hosts"); err != nil {
-		fmt.Printf("error %s\n", err.Error())
-		os.Exit(1)
+		log.Fatalf("error %s\n", err.Error())
 	}
 	r, err := u.Resolve("www.nlnetlabs.nl.", dns.TypeA, dns.ClassINET)
 	if err != nil {
-		fmt.Printf("error %s\n", err.Error())
-		os.Exit(1)
+		log.Fatalf("error %s\n", err.Error())
 	}
 	fmt.Printf("%+v\n", r)
 }