Add documentations for DatumaroApp

[sooahleex]

Summary

• Add documentation for DatumaroApp

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 the description of my changes into CHANGELOG.​
• [X] I have updated the documentation accordingly

License

• [ ] I submit my code changes under the same MIT 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: MIT

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (releases/2.0.0@3b1198c). Click here to learn what that means.

Additional details and impacted files

@@                Coverage Diff                @@
##             releases/2.0.0    #1345   +/-   ##
=================================================
  Coverage                  ?   80.86%           
=================================================
  Files                     ?      271           
  Lines                     ?    30674           
  Branches                  ?     6195           
=================================================
  Hits                      ?    24804           
  Misses                    ?     4486           
  Partials                  ?     1384           

Flag	Coverage Δ
ubuntu-20.04_Python-3.10	80.84% <ø> (?)
windows-2022_Python-3.10	80.83% <ø> (?)

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