Use REUSE to specify licensing info

src/module/actor/sheets/actor-sheet.ts

@@ -1,3 +1,10 @@
+// SPDX-FileCopyrightText: 2021 Johannes Loher
+// SPDX-FileCopyrightText: 2021 Oliver Rümpelein
+// SPDX-FileCopyrightText: 2021 Gesina Schwalbe
+// SPDX-FileCopyrightText: 2021 Siegfried Krug
+//
+// SPDX-License-Identifier: MIT
+
 import { ModifiableDataBaseTotal } from "../../common/common-data";
 import { DS4 } from "../../config";
 import { getCanvas } from "../../helpers";

src/module/actor/sheets/character-sheet.ts

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2021 Johannes Loher
+//
+// SPDX-License-Identifier: MIT
+
 import { DS4ActorSheet } from "./actor-sheet";
 
 /**

src/module/actor/sheets/creature-sheet.ts

@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2021 Johannes Loher
+//
+// SPDX-License-Identifier: MIT
+
 import { DS4ActorSheet } from "./actor-sheet";
 
 /**