Add registry text for blocking Microsoft account generation

- This registry.txt will be converted into a policy file and applied by
LGPO in the Enable-LocalSecurityPolicy function

[#166090898](https://www.pivotaltracker.com/story/show/166090898)
 2.3.1.2 (L1) Ensure 'Accounts: Block Microsoft accounts' is set to 'Users can't add or log on with Microsoft accounts'

Co-authored-by: Malini Valliath <[email protected]>

Author: GarimaSharma