added empty documentation files

docs/config.json

docs/content/createpage.de.md

docs/content/dirstructure.de.md

docs/content/mdsyntax.de.md

docs/content/metadata.de.md

docs/content/quickstart.de.md

docs/index.de.md

docs/internal/content_format.de.md

docs/tags/admin.de.md

docs/tags/content.de.md

docs/tags/internal.de.md