title: Upload image using formdata in react-native
body: <p>How can i upload file to server using react-native's fetch api
  Need to achieve something similar to this-</p>
  
  <pre><code>------WebKitFormBoundaryRAxza9ew2ADaYHn5
  Content-Disposition: form-data; name="file"; filename="66154520.jpg"
  Content-Type: image/jpeg
  
  
  ------WebKitFormBoundaryRAxza9ew2ADaYHn5--
  </code></pre>