Add REUSE complience check to workflows

.github/workflows/reuse.yml

@@ -0,0 +1,24 @@
+# SPDX-FileCopyrightText: The PFDL VS Code Extension Contributors
+# SPDX-License-Identifier: CC0-1.0
+
+name: REUSE Compliance Check
+
+on: 
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+jobs:
+  reuse:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - name: REUSE Compliance Check
+        uses: fsfe/reuse-action@a46482ca367aef4454a87620aa37c2be4b2f8106 # v3.0.0