Add copyright information for REUSE

CONTRIBUTING.md

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+<!--
+SPDX-FileCopyrightText: 2025 Pierre Francois <https://github.com/Bachibouzouk> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Christian Winger <https://github.com/wingechr> © Öko-Institut e.V.
+SPDX-FileCopyrightText: 2025 Jonas Huber <https://github.com/jh-RLI> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Jonas Huber <https://github.com/jh-RLI> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Christian Winger <https://github.com/wingechr> © Öko-Institut e.V.
+
+SPDX-License-Identifier: CC0-1.0
+-->
+
 ## Development
 
 ### Prerequisites

LICENSES/CC0-1.0.txt

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+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
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+
+Statement of Purpose
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+The laws of most jurisdictions throughout the world automatically confer
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+1. Copyright and Related Rights. A Work made available under CC0 may be
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+2. Waiver. To the greatest extent permitted by, but not in contravention
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+3. Public License Fallback. Should any part of the Waiver for any reason
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+applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder
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+4. Limitations and Disclaimers.
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LICENSES/MIT.txt

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+MIT License
+
+Copyright <YEAR> <COPYRIGHT HOLDER>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+<!--
+SPDX-FileCopyrightText: 2025 Adel Memariani <https://github.com/adelmemariani> © Otto-von-Guericke-Universität Magdeburg
+SPDX-FileCopyrightText: 2025 Pierre Francois <https://github.com/Bachibouzouk> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Pierre Francois <https://github.com/Bachibouzouk> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Christian Winger <https://github.com/wingechr> © Öko-Institut e.V.
+SPDX-FileCopyrightText: 2025 Eike Broda <https://github.com/ebroda>
+SPDX-FileCopyrightText: 2025 Johann Wagner <https://github.com/johannwagner>  © Otto-von-Guericke-Universität Magdeburg
+SPDX-FileCopyrightText: 2025 Johann Wagner <https://github.com/johannwagner>  © Otto-von-Guericke-Universität Magdeburg
+SPDX-FileCopyrightText: 2025 Johann Wagner <https://github.com/johannwagner>  © Otto-von-Guericke-Universität Magdeburg
+SPDX-FileCopyrightText: 2025 Jonas Huber <https://github.com/jh-RLI> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Jonas Huber <https://github.com/jh-RLI> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Kirann Bhavaraju <https://github.com/KirannBhavaraju> © Otto-von-Guericke-Universität Magdeburg
+SPDX-FileCopyrightText: 2025 Ludwig Hülk <https://github.com/Ludee> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Martin Glauer <https://github.com/MGlauer> © Otto-von-Guericke-Universität Magdeburg
+SPDX-FileCopyrightText: 2025 Martin Glauer <https://github.com/MGlauer> © Otto-von-Guericke-Universität Magdeburg
+SPDX-FileCopyrightText: 2025 Martin Glauer <https://github.com/MGlauer> © Otto-von-Guericke-Universität Magdeburg
+SPDX-FileCopyrightText: 2025 Pierre Francois <https://github.com/Bachibouzouk> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 RL-INSTITUT\hendrik.huyskens <https://github.com/henhuy> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Christian Winger <https://github.com/wingechr> © Öko-Institut e.V.
+SPDX-FileCopyrightText: 2025 Jonas Huber <https://github.com/jh-RLI> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Jonas Huber <https://github.com/jh-RLI> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Lara Christmann <https://github.com/solar-c> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Mirjam Stappel <https://github.com/stap-m> © Fraunhofer IEE
+SPDX-FileCopyrightText: 2025 Christian Winger <https://github.com/wingechr> © Öko-Institut e.V.
+
+SPDX-License-Identifier: CC0-1.0
+-->
+
 | Workflow        | Status-Badge & Link                                                                                                                                                                                                  |
 | --------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | Automated tests | [![Automated tests](https://github.com/OpenEnergyPlatform/oeplatform/actions/workflows/automated-testing.yaml/badge.svg)](https://github.com/OpenEnergyPlatform/oeplatform/actions/workflows/automated-testing.yaml) |

RELEASE_PROCEDURE.md

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+<!--
+SPDX-FileCopyrightText: 2025 Christian Winger <https://github.com/wingechr> © Öko-Institut e.V.
+SPDX-FileCopyrightText: 2025 Jonas H <https://github.com/jh-RLI> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Jonas Huber <https://github.com/jh-RLI> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Jonas Huber <https://github.com/jh-RLI> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Christian Hofmann <https://github.com/christian-rli> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Jonas Huber <https://github.com/jh-RLI> © Reiner Lemoine Institut
+SPDX-FileCopyrightText: 2025 Jonas Huber <https://github.com/jh-RLI> © Reiner Lemoine Institut
+
+SPDX-License-Identifier: CC0-1.0
+-->
+
 # Release procedure
 
 Here we will describe a process that takes place after a contributor has successfully integrated