add document attributes

Reviewed-by: Tino Schreiber <tino.schreiber@t-systems.com>
Co-authored-by: Sebastian Gode <sebastian.gode@telekom.de>
Co-committed-by: Sebastian Gode <sebastian.gode@telekom.de>

README.rst

@@ -52,3 +52,16 @@ the key is :code:`service_type` which has the foreign key in the
 document can only be linked to one service.
 The key :code:`service_category` table is :code:`name` of the service category
 which is then used in the :code:`services` table as foreign key.
+
+File structure: documents
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+* hc_location: reference to Huawei Cloud part
+* html_location: place where the documents are stored in doc-exports
+* link: URI document
+* pdf_enabled: true| false ; enable pdf generation
+* pdf_enviroment public|internal|hidden: environment where the pdfs are shown in the SBV
+* rst_location: folder location of this specific in the source repo
+* service_type: primary key of service name
+* title: written title of the service
+* type: document type