title: How to retrieve current user details using provider package?
body: <p>I want to use fetch user details from firestore data tree eg:</p>
  
  <pre><code>- "Users"
     - user.uid
         - name
         - age
  </code></pre>
  
  <p>using provider package.</p>
  
  <p>Then I can user username or age value globally in app. Can anyone please provide a code example for this? Thanks in advance. </p>