feat(docs): app change documents (#200)

Co-authored-by: Phil Schneider <info@philschneider.de>
Reviewed-by: Phil Schneider <info@philschneider.de>

docs/04. App(s)/06. App Change Process/07. Document Change.md

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+### Document Change
+
+<br>
+
+<img width="636" alt="image" src="/docs/static/update-contract-documents.png">
+
+<br>
+
+#### Add Documents
+
+To add documents (such as an image or app details) to an existing published app, navigate as app manager to the app overview (app management) and select the respective app and click on "Change Document"
+
+1st select the respective document type and click on the "Upload document" button.
+Via click, an overlay appears where the actual document can get loaded.
+
+<br>
+
+2nd click into the drag&drop element.
+
+<br>
+
+3rd choose the document files you wish to upload from your device. Supported formats and size limits will be outlined in the app.
+
+<br>
+
+4th by placing/selecting the document, the upload is getting initiated automatically.
+
+<br>
+<br>
+
+#### Deleting
+
+1st Navigate to the document you want to delete.
+
+<br>
+
+2nd click on the delete icon next to the respective document
+
+<br>
+
+The document is successfully deleted. The process can not get reverted.

docs/static/update-contract-documents.png.license

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+This work is licensed under the [CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/legalcode).
+
+- SPDX-License-Identifier: CC-BY-4.0
+- SPDX-FileCopyrightText: Copyright (c) 2021, 2023 Contributors to the Eclipse Foundation
+- Source URL: https://github.com/eclipse-tractusx/portal-assets
+