Apply REUSE licensing

Author: goerz

.coverage/.gitignore

@@ -1 +1,5 @@
+# SPDX-FileCopyrightText: © 2022 Michael Goerz <mail@michaelgoerz.net>
+#
+# SPDX-License-Identifier: MIT OR CC0-1.0
+
 *.info

.github/dependabot.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: © 2022 Michael Goerz <mail@michaelgoerz.net>
+#
+# SPDX-License-Identifier: MIT OR CC0-1.0
+
 # https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
 version: 2
 updates:

.github/workflows/CI.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: © 2022 Michael Goerz <mail@michaelgoerz.net>
+#
+# SPDX-License-Identifier: MIT OR CC0-1.0
+
 name: CI
 on:
   push:

.github/workflows/CompatHelper.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: © 2022 Michael Goerz <mail@michaelgoerz.net>
+#
+# SPDX-License-Identifier: MIT OR CC0-1.0
+
 name: CompatHelper
 on:
   schedule:

.github/workflows/REUSE.yml

@@ -0,0 +1,27 @@
+# SPDX-FileCopyrightText: © 2022 Michael Goerz <mail@michaelgoerz.net>
+#
+# SPDX-License-Identifier: MIT OR CC0-1.0
+
+name: REUSE
+on:
+  push:
+    branches:
+      - master
+      - dev
+      - 'release-*'
+    tags:
+      - '*'
+  pull_request:
+    branches:
+      - master
+permissions:
+  contents: read
+jobs:
+  reuse-compliance-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: REUSE Compliance Check
+        uses: fsfe/reuse-action@v6

.github/workflows/TagBot.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: © 2022 Michael Goerz <mail@michaelgoerz.net>
+#
+# SPDX-License-Identifier: MIT OR CC0-1.0
+
 name: TagBot
 on:
   issue_comment:

.gitignore

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: © 2022 Michael Goerz <mail@michaelgoerz.net>
+#
+# SPDX-License-Identifier: MIT OR CC0-1.0
+
 *.jl.*.cov
 *.jl.cov
 *.jl.mem

CONTRIBUTING.md

@@ -1,3 +1,9 @@
+<!--
+SPDX-FileCopyrightText: © 2022 Michael Goerz <mail@michaelgoerz.net>
+
+SPDX-License-Identifier: MIT OR CC0-1.0
+-->
+
 # Contributing
 
 Everyone is welcome to contribute! You can contribute simply by opening issues to report bugs or request features.
@@ -6,4 +12,9 @@ Development of all packages in the [JuliaQuantumControl] organization follows sh
 
 <https://github.com/JuliaQuantumControl/.github/blob/master/CONTRIBUTING.md>
 
+
+## Licensing
+
+This package is [REUSE-compliant](https://reuse.software): every file declares its copyright and license via SPDX tags, which CI enforces (verify locally with `make reuse`). When adding a new file, include an SPDX header (or a sidecar `*.license` file when the format has no comment syntax) with the copyright `© <year> Michael Goerz <mail@michaelgoerz.net>`, and choose the license by category: source code (`src/`, `ext/`, `test/`) → `MIT`; prose/documentation (`README`, `docs/src/*.md`) → `MIT OR CC-BY-4.0`; trivial config/tooling (`Makefile`, `.gitignore`, CI YAML, `Project.toml`, …) → `MIT OR CC0-1.0`. Any license used must have its text in `LICENSES/`.
+
 [JuliaQuantumControl]: https://github.com/JuliaQuantumControl

LICENSE

@@ -1,6 +1,15 @@
+This project follows the REUSE specification for copyright and licensing
+information. The authoritative copyright and licensing information is provided
+by SPDX notices in individual files and, where applicable, by REUSE.toml.
+
+The primary source code for the package is licensed under the MIT License
+(below). The full license texts for the licenses used in this project are
+located in the LICENSES/ directory. See https://reuse.software/ for more
+information about the REUSE specification.
+
 MIT License
 
-Copyright (c) 2022 Michael Goerz <mail@michaelgoerz.net>
+Copyright (c) 2022 Michael Goerz <mail@michaelgoerz.net> and contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal