I am not getting difference between,

1. IS doc and specification file
   2)Creation package and folder…is only 1 package or folder is enough? for Each package is folder a must??

Hi ,
Answer to your second question… Yes one package is enough, Yes for each package a folder is must , because package name doesnt reflect in the name space. So it is best pratice to have a folder with same as that package inside the package and then subfolders.

Irfan

He is right. Due to namespace issues, you need to do something like the following where
example package name is: processFiles

processFiles
–processFiles
----docs
----flows
----adapters
----services

_brett.