Rename VagrantFile, update README.md

Frank Duncanrequested to merge
github/fork/hawkinsw/main into main

Created by: hawkinsw

  1. Using vagrant version 2.2.15, Vagrantfiles must be named Vagrantfile and not VagrantFile.
  2. Update the README.md to give specific instructions on how to install guest addition plugins on the VM.
  3. Update README.md to add a note about the requirement to change certain parts of the .env file for a successful deployment.

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