Add check "Existence Of Documentation Infrastructure"

"Used to assess compliance with a common development process and certain software quality standards. For this purpose, it is checked whether the repository provides documentation for the software made available. It should be noted that this is not a sufficient criterion, since in this case only the existence of certain folders or wiki pages is checked."

See tasks of https://gitlab.opencode.de/opencode-analyzer/occmd/-/issues/66 for further details.