Added database design documentation

Signed-off-by: Roland Häder <roland@mxchange.org>

diff --git a/docs/de/06 - Adressbuch - Datenbankdesign.odt b/docs/de/06 - Adressbuch - Datenbankdesign.odt
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diff --git a/docs/src/addressbook.odb b/docs/src/addressbook.odb
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