Add signoff check to CI

Adds a copy of the reuse compliance check from AtomVM workflows, and adds
coppies of licenses to `LICENSES` directory.

Signed-off-by: Winford <winford@object.stream>

.github/workflows/reuse-lint.yaml

@@ -0,0 +1,19 @@
+# SPDX-FileCopyrightText: 2022 Free Software Foundation Europe e.V. <https://fsfe.org>
+#
+# SPDX-License-Identifier: CC0-1.0
+
+name: REUSE Compliance Check
+
+on: [push, pull_request]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref != 'refs/heads/main' && github.ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: REUSE Compliance Check
+      uses: fsfe/reuse-action@v1

LICENSES/Apache-2.0.txt

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
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+
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LICENSES/CC0-1.0.txt

@@ -0,0 +1,121 @@
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