title: Compund Query with OR operator flutter and firebase
body: <p>I am creating a flutter app that should query a Firestore collection and return results if two conditions are met. Here is my code:</p>
  
  <pre><code>Stream&lt;List&lt;FormQuestions&gt;&gt; get question {
    return someCollection
    .where('myQUestion', isEqualTo: 'nameQuestion')
    .snapshots()
    .map(_someQuestionListFromSnapshot);
  }
  </code></pre>
  
  <p>If I do with just one .where() condition, it works fine. But with two, it gives no results although I have documents that meet both conditions. I would like it to return for multiple .where() conditions like so:</p>
  
  <pre><code>Stream&lt;List&lt;FormQuestions&gt;&gt; get question {
    return someCollection
    .where('myQUestion', isEqualTo: 'nameQuestion')
    .where('myQuestion', isEqualTo: 'ageQuestion')
    .snapshots()
    .map(_someQuestionListFromSnapshot);
  }
  </code></pre>
  
  <p>Is there a way to add an OR(||) operator or how can I do this so that I get results for both "nameQuestion" and "ageQuestion"?
   Kindly assist. Thanks.</p>