Create mydemo.txt

[RUS420]

Created a demo file

PR Description

Related Issue

Close #

Checklist

• Did you add a function?
• Did you add the tests?
• Did you follow the steps we provided?

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PR Compliance Checks

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Issue Reference

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This check is looking for a phrase similar to: "Fixes #XYZ" or "Resolves #XYZ" where XYZ is the issue number that this PR is meant to address.

Protected Branch

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Conventional Commit PR Title

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Most often, our PR titles are something like one of these:

• docs: correct typo in README
• feat: implement dark mode"
• fix: correct remove button behavior

Linting Errors

• Found type "null", must be one of "feat","fix","docs","style","refactor","perf","test","build","ci","chore","revert"
• No subject found