Update request - Read text from last to first line

[doctordns]

Wants to read a text file backwards - show how you can do this with an array

Summary of the update request

• Link to the post in the old blog: https://devblogs.microsoft.com/scripting/can-i-read-a-text-file-from-the-bottom-up/

• Description of what needs to be changed:
  Should be converted to be in powershell

Also - add small section on arrays.

[doctordns]

resolved by #34