title: Create CSV or TXT file in app and save it to 'download' folder - Android
body: <p>I searched and tried a lot before asking this.
  But all the code that I'm trying is not working.
  I want the file to be stored in the <code>download</code> folder and be accessible from the user also if he uninstalls the app.
  I also tried using <code>opencsv</code> library. Could you provide a <code>tested</code> way to create a <code>csv</code> or <code>txt</code> file and store to <code>download</code> folder?</p>