Add mising license headers

Author: bcbnz

.github/workflows/publish.yml

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: Blair Bonnett
+# SPDX-License-Identifier: BSD-3-Clause
+
 name: Build and publish Python distributions
 
 # Build distributions on every push. Only tagged versions will be published.

doc/REUSE.toml

@@ -0,0 +1,9 @@
+# SPDX-FileCopyrightText: Blair Bonnett
+# SPDX-License-Identifier: 0BSD
+
+version = 1
+
+[[annotations]]
+path = "**/*.toml"
+SPDX-FileCopyrightText = "Blair Bonnett"
+SPDX-License-Identifier = "0BSD"