Initial commit

.github/workflows/check.yml

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+# Forgejo and Gitea Actions both read .github/workflows when their own folder is absent.
+name: check
+on: [push, pull_request]
+jobs:
+  check:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - name: Second schema validator
+        run: python3 -m pip install jsonschema referencing
+      - name: Check the repository
+        run: python3 tools/check.py
+      - name: Lint Markdown
+        if: matrix.os == 'ubuntu-latest'
+        run: npx --yes markdownlint-cli@0.48.0 '**/*.md'