fix reuse compliance and add reuse pre-commit

.git-blame-ignore-revs

@@ -1,2 +1,7 @@
+# SPDX-FileCopyrightText: : 2022 The PyPSA-Eur Authors
+#
+# SPDX-License-Identifier: CC0-1.0
+
+# Exclude pre-commit applications
 5d1ef8a64055a039aa4a0834d2d26fe7752fe9a0
 92080b1cd2ca5f123158571481722767b99c2b27

.pre-commit-config.yaml

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: : 2022 The PyPSA-Eur Authors
+#
+# SPDX-License-Identifier: CC0-1.0
 exclude: "^LICENSES"
 
 repos:
@@ -81,3 +84,9 @@ repos:
   hooks:
   - id: jupyter-notebook-cleanup
     exclude: examples/solve-on-remote.ipynb
+
+# Check for FSFE REUSE compliance (licensing)
+- repo: https://github.com/fsfe/reuse-tool
+  rev: v0.14.0
+  hooks:
+  - id: reuse