message: add proxies to reactivity example
diff: +// @ts-check
  +
  /* const person = {
  name: 'Nerea',
  }
  @@ -19,3 +21,32 @@ console.log(person.name)
  person.name = 'Alfredo'
  console.log(person.name)
  +
  +// ==============
  +
  +// Ejemplo con Proxies
  +
  +const person2 = {
  + name: 'Nerea',
  +}
  +
  +type person2Keys = keyof typeof person2
  +
  +const person2Proxy = new Proxy(person2, {
  + get(target: typeof person2, prop: person2Keys) {
  + console.log('get!!', target, prop)
  +
  + return target[prop]
  + },
  + set(target: typeof person2, prop: person2Keys, value: string) {
  + console.log('set!!', target, prop, value)
  +
  + return Reflect.set(target, prop, value)
  + },
  +})
  +
  +console.log(person2Proxy.name)
  +
  +person2Proxy.name = 'Alfredo'
  +
  +console.log(person2Proxy.name)
  