[ru] Add "Tightly Coupled Architecture"

[hcz]

Describe your changes

[ru] Add "Tightly Coupled Architecture" #3203

Related issue number or link (ex: resolves #issue-number)

Checklist before opening this PR (put x in the checkboxes)

• [x] This PR does not contain plagiarism
  • don’t copy other people’s work unless you are quoting and contributing it to them.
• [x] I have signed off on all commits
  • signing off (ex: git commit -s) is to affirm that commits comply DCO. If you are working locally, you could add an alias to your gitconfig by running git config --global alias.ci "commit -s".

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[kirkonru]

@hcz Thanks for your contribution! Please note that you have to use dev-ru both as a source to create your own branch when editing/adding files and as a target one to merge your PR into. IMO, the easiest way to proceed is to close this PR and create a new one with dev-ru as a source/target.