Add codespell workflow

.codespellrc

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+[codespell]
+skip = .git,*.pdf,*.svg,pnpm-lock.yaml

.github/workflows/codespell.yml

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+name: Codespell
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Codespell
+      uses: codespell-project/actions-codespell@v2