Create owners.txt (PowerShell#1523)

tool/owners.txt

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+; this is an example owners.txt file which can be added at any level in the repo to indicate owners of a subtree
+; this file is used by ownership enforcer to determine reviewers to add to a pull request
+; you can add comments using ; as prefix
+; introduce each owner in a separate line with his/her alias (not email address)
+; prefixing an alias with * means that the owner will not be automatically added as a reviewer to pull requests to reduce noise, but can still be manually added and can sign off if necessary
+; to learn more you can read https://microsoft.sharepoint.com/teams/WAG/EngSys/EngPipeline/cdp/SitePages/Configure%20checkin%20gates.aspx
+; if you do not wish to use this feature then you can delete this file
+; example (pretend the following lines are not commented):
+;
+; developer1
+; developer2
+; *developer3
+annavied
+americks
+adityap
+*slee