title: how to enable persistance storage in firestore?
body: <p>I am working on react-native with firestore and creating an offline application. The data should be stored in firestore when there is an healthy internet connection. If not, it should be stored in cache.</p>
  
  <p>In firestore, there is an Enable offline data where the data can be stored offline. But, I didn't understand what and where exactly I've to write into that.</p>
  
  <p>So anyone can help me out?</p>
  
  <p>Thanks in advance</p>