Implement Local File Source

       This week,  I implement the medicurator  for Local file source.

       Through my test, it proves to have been working well. The test  local file is under the path:medicurator/target/classes/image

       It can be downloaded through the web application written last week.

      The downloaded file is now stored at medicurator/target/classes/local.test
      The path can be changed in Constant.java
   
      Afterwards, I will finish the complete workflow on downloaded tracking to solve the delete problem. I think I should implement a delete invoke function so that when the user's delete behavior  through the website or the delete message sent from the duplicate detect, it will invoke the function.