How to Approve document in document library by default?

OK.

 

I will tryi it.

 

I there any way to update this using workflow? 

Are you looking for something like this:

 

https://social.technet.microsoft.com/Forums/office/en-US/0b915df7-6cef-4121-ba2d-999662659a27/approve-workflow-task-programatically?forum=sharepointdevelopmentprevious