Installation 

Requirements 

Install the extension 

composer require proudnerds/pn-backend-manual
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Let the sitepackage or extension that ships a manual depend on it as well, because its Services.yaml refers to the widget class:

composer.json of the sitepackage or extension
"require": {
    "proudnerds/pn-backend-manual": "^1.0"
}
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No database changes, no TypoScript, no site set. Continue with Adding a manual.