Add license information for README.md

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

README.md.license

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+SPDX-FileCopyrightText: 2017 - 2025 MDAD project contributors
+SPDX-FileCopyrightText: 2017 - 2025 Slavi Pantaleev
+SPDX-FileCopyrightText: 2018 - 2021 Aaron Raimist
+SPDX-FileCopyrightText: 2019 - 2020 Hugues Morisset
+SPDX-FileCopyrightText: 2019 Edgars Voroboks
+SPDX-FileCopyrightText: 2019 Eduardo Beltrame
+SPDX-FileCopyrightText: 2020 Björn Marten
+SPDX-FileCopyrightText: 2020 Lee Verberne
+SPDX-FileCopyrightText: 2020 Marcel Partap
+SPDX-FileCopyrightText: 2020 Matthew Croughan
+SPDX-FileCopyrightText: 2020 Tulir Asokan
+SPDX-FileCopyrightText: 2021 Alexandar Mechev
+SPDX-FileCopyrightText: 2021 Béla Becker
+SPDX-FileCopyrightText: 2021 Cody Neiman
+SPDX-FileCopyrightText: 2021 Marcus Proest
+SPDX-FileCopyrightText: 2021 Matthew Cengia
+SPDX-FileCopyrightText: 2021 Prasiddh Pooskur
+SPDX-FileCopyrightText: 2021 Toni Spets
+SPDX-FileCopyrightText: 2021 Yannick Goossens
+SPDX-FileCopyrightText: 2022 - 2023 Cody Wyatt Neiman
+SPDX-FileCopyrightText: 2022 - 2025 Nikita Chernyi
+SPDX-FileCopyrightText: 2022 Andrew Morgan
+SPDX-FileCopyrightText: 2022 Christos Karamolegkos
+SPDX-FileCopyrightText: 2022 Dennis Ciba
+SPDX-FileCopyrightText: 2022 Julian Foad
+SPDX-FileCopyrightText: 2022 Julian-Samuel Gebühr
+SPDX-FileCopyrightText: 2022 Kim Brose
+SPDX-FileCopyrightText: 2023 - 2024 Michael Hollister
+SPDX-FileCopyrightText: 2023 Joe Kappus
+SPDX-FileCopyrightText: 2023 Pierre 'McFly' Marty
+SPDX-FileCopyrightText: 2023 Shreyas Ajjarapu
+SPDX-FileCopyrightText: 2024 - 2025 Suguru Hirahara
+
+SPDX-License-Identifier: AGPL-3.0-or-later