Stringer in Go

One of the most ubiquitous interfaces is Stringer defined by the fmt package.
```
type Stringer interface {
    String() string
}
```
A Stringer is a type that can describe itself as a string. The fmt package (and many others) look for this interface to print values. 
```
package main

import "fmt"

type Person struct {
	Name string
	Age  int
}

func (p Person) String() string {
	return fmt.Sprintf("%v (%v years)", p.Name, p.Age)
}

func main() {
	a := Person{"Arthur Dent", 42}
	z := Person{"Zaphod Beeblebrox", 9001}
	fmt.Println(a, z)
}
```
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