PR Summary

Add VSTS CI build badges for master branch of Windows, Linux and macOS CI builds to README.md
The best reviewer is probably @TravisEz13

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• [NA] Change is not breaking
• [NA] Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.
• User-facing changes
  • [NA] Not Applicable
  • OR
  • [NA] User-facing Documentation needed
    • Issue filed - Issue link:
• Testing - New and feature
  • [NA] Not Applicable or can only be tested interactively
  • OR
  • Make sure you've added a new test if existing tests do not effectively test the code changed
    • Add [feature] if the change is significant or affects feature tests