fix: add licensing information

Author: mmjohansson

REUSE.toml

@@ -30,7 +30,8 @@ path = [
     "images/dok17.png",
     "images/dok19.png",
     "images/dok20.png",
-    "images/dok21.png",
+    "images/dok21-1.png",
+    "images/dok21-2.png",
     "images/dok3.png",
     "images/dok6-1.png",
     "images/dok6-2.png",

src/types/openapi-3.0.d.ts

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2025 Digg - Agency for Digital Government
+//
+// SPDX-License-Identifier: EUPL-1.2
+
 /**
  * TypeScript type definitions for OpenAPI 3.2.0
  * Based on: https://spec.openapis.org/oas/v3.2.0.html