Script for moving files and folders to subdirectory in structure

hey all! hope i can find some help here..

i got following folder structure

root/folder_A/somefile

root/folder_B/somedir

….

i want to create a directory in every root folder like

root/folder_A/newfolder

root/folder_B/newfolder

…

and move all existing items (files and folders) to this new directory

like:

move “root/folder_A/somefile” to “root/folder_A/newfolder”

or

move “root/folder_B/somedir” to “root/folder_B/newfolder”

i think i have the command to create the directory structure, but moving everything inside is beyond my knowledge in PS scripting

thanks in advance!