title: Mongo Query, Find whether a string is present in an array
body: <pre><code>Person = { name: string}
  const names = {John, Mark, Fady}
  </code></pre>
  
  <p>how to make a find query to get all the persons that their names are in the array?
  i could make a loop over the array and make a find query for every element but this will not be efficient since it will make N find queries.</p>