title: how to find two consecutive rows in a dataframe with same value(string) for a column and add more rows between them?
body: <p>How to find two consecutive rows in a dataframe with same value(string) for a column and add more rows between them? The dataframe has timeseries index.</p>
  
  <p>eg: if the index for 2 consecutive rows with the same value for column A are 5:30 pm and 6:00 pm, i want to add more rows with 1 minute increment between the 2 rows ie. 5:01 pm, 5:02 pm.....5:59 pm.</p>