title: Use pygsheets to create a brand-new sheet using the service_file authorization method
body: <p>I can already edit an existing sheet by using the open_by_key() function but I would like to be able to create a brand-new sheet.</p>
  
  <p>When I try the following code:</p>
  
  <pre><code>import pygsheets
  
  creds_file = "/Users/jerome/audible2googlesheet.json"
  
  gc = pygsheets.authorize(service_file=creds_file)
  sh = gc.open("my_1st_public_sheet")
  wks = sh.sheet1
  
  # Update a single cell.                                                                                                                                                                                                                                                                                                               
  wks.update_value('A1', "some value")
  
  sh.share('', role='reader', type='anyone')
  </code></pre>
  
  <p>I get this exception/error:</p>
  
  <blockquote>
    <p>raise SpreadsheetNotFound('Could not find a spreadsheet with title %s.' % title)
    pygsheets.exceptions.SpreadsheetNotFound: Could not find a spreadsheet with title my_1st_public_sheet.</p>
  </blockquote>
  
  <p>What am I missing?</p>