docs: create common folder structure

docs/README.md

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+## Documentation
+
+Follow these links to jump to the according sections
+
+- [Admin](./admin)
+- [API](./api)
+- [Architecture](./architecture)
+- [Developer](./developer)
+- [User](./user)
+
+## NOTICE
+
+This work is licensed under the [Apache-2.0](https://www.apache.org/licenses/LICENSE-2.0).
+
+- SPDX-License-Identifier: Apache-2.0
+- SPDX-FileCopyrightText: 2024 Contributors to the Eclipse Foundation
+- Source URL: https://github.com/eclipse-tractusx/portal-assets

docs/admin/README.md

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+### Admin Documentation
+
+There is no content here yet.
+
+## NOTICE
+
+This work is licensed under the [Apache-2.0](https://www.apache.org/licenses/LICENSE-2.0).
+
+- SPDX-License-Identifier: Apache-2.0
+- SPDX-FileCopyrightText: 2024 Contributors to the Eclipse Foundation
+- Source URL: https://github.com/eclipse-tractusx/portal-assets

docs/api/README.md

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+### API Documentation
+
+Go to the [API Hub](https://eclipse-tractusx.github.io/api-hub/)
+
+## NOTICE
+
+This work is licensed under the [Apache-2.0](https://www.apache.org/licenses/LICENSE-2.0).
+
+- SPDX-License-Identifier: Apache-2.0
+- SPDX-FileCopyrightText: 2024 Contributors to the Eclipse Foundation
+- Source URL: https://github.com/eclipse-tractusx/portal-assets

docs/architecture/README.md

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+### Architecture Documentation
+
+There is no content here yet.
+
+## NOTICE
+
+This work is licensed under the [Apache-2.0](https://www.apache.org/licenses/LICENSE-2.0).
+
+- SPDX-License-Identifier: Apache-2.0
+- SPDX-FileCopyrightText: 2024 Contributors to the Eclipse Foundation
+- Source URL: https://github.com/eclipse-tractusx/portal-assets