Add Copyright header

[CecileRobertMichon]

What this PR does / why we need it:

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged):

Fixes #12

Special notes for your reviewer:

If applicable:

• documentation
• unit tests
• tested backward compatibility (ie. deploy with previous version, upgrade with this branch)

Release note:

[mboersma]

/lgtm

[tariq1890]

@CecileRobertMichon Can we update the year in License.txt ? Feel free to do that in another PR if you wish.

[mboersma]

/lgtm

[tariq1890]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CecileRobertMichon, mboersma, tariq1890

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Needs approval from an approver in each of these files:

• OWNERS [CecileRobertMichon,mboersma,tariq1890]

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[codecov]

Codecov Report

Merging #23 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #23   +/-   ##
=======================================
  Coverage   46.89%   46.89%           
=======================================
  Files          91       91           
  Lines       13800    13800           
=======================================
  Hits         6471     6471           
  Misses       6721     6721           
  Partials      608      608