Create Tutorial-km-md

[kuth-chi]

I add Tutorial in Khmer

e.g. Fixes #0

Checklist:

• The GitHub pipeline is OK (green),
  meaning that both pylint (static code analyzer) and black (code formatter) are happy with the changes of this PR.

• A unit test is covering the code added / modified by this PR

• This PR is ready to be merged

• In case of a new feature, docstrings have been added, with also some documentation in the docs/ folder

• A mention of the change is present in CHANGELOG.md

By submitting this pull request, I confirm that my contribution is made under the terms of the GNU LGPL 3.0 license.

[kuth-chi]

Please check my pull request to main.

[Lucas-C]

@allcontributors please add @kuth-chi for translation

[allcontributors]

@Lucas-C

I've put up a pull request to add @kuth-chi! 🎉

[Lucas-C]

Thank you for this translation @kuth-chi!

The PR looks great!

There are a few of extra things that should be added,
to integrate this translated tutorial similarly to the other ones:

• a mention in the file named CHANGELOG.md, about this new translation
  (the file already contains mentions of previous translations being added, that can serve as examples to you)
• add a link to your tutorial in the file named README.md, in the "Documentation" section, similar to the other ones
• add a link to your tutorial in docs/index.md, in the "Tutorials" section, similar to the other ones

@kuth-chi: would like to include this as part of this Pull Request?
Else, I can merge your contribution and add them myself afterward.