Update for_developer md files

[harimkang]

Summary

• Update setup_guide.md
• Update dir_structure.md
• Add cli_guide.md

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) 2023 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[samet-akcay]

for_developers directory is a temporary one until we finish the execution, right? If yes, that's absolutely fine. If no, we should ideally have this in the documentation

[harimkang]

for_developers directory is a temporary one until we finish the execution, right? If yes, that's absolutely fine. If no, we should ideally have this in the documentation

For now, I believe that folder is for current OTX 2.0 contributors (Execution team members).
It would be great to discuss this as we work on the documentation phase. :) - I think this is something that could be included as part of the documentation.