Maintainers.txt: Add .github maintainers and reviewers
Adds the maintainers and reviewers for the new .github directory
being added to hold GitHub workflows files.
Cc: Andrew Fish <afish@apple.com> Cc: Leif Lindholm <quic_llindhol@quicinc.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Sean Brogan <sean.brogan@microsoft.com> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>