Copy LICENSE file into demo directory for not editable installation

[eunwoosh]

Summary

This PR copies LICENSE file into demo directory for not editable installation.

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added e2e tests for validation.
• I have added the description of my changes into CHANGELOG in my target branch (e.g., CHANGELOG in develop).​
• I have updated the documentation in my target branch accordingly (e.g., documentation in develop).
• I have linked related issues.

License

• I submit my code changes under the same Apache License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2024 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.07%. Comparing base (16683f2) to head (5ebd346).

Additional details and impacted files

@@               Coverage Diff               @@
##           releases/2.0.0    #3255   +/-   ##
===============================================
  Coverage           80.06%   80.07%           
===============================================
  Files                 186      186           
  Lines               15397    15397           
===============================================
+ Hits                12328    12329    +1     
+ Misses               3069     3068    -1     

Flag	Coverage Δ
py310	80.06% <100.00%> (ø)
py311	80.07% <100.00%> (?)

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[vinnamkim]

Please add a test to show that it is working

[eunwoosh]

Please add a test to show that it is working

I did it