add codespell workflow (#4)

Signed-off-by: Manabu McCloskey <manabu.mccloskey@gmail.com>

.github/workflows/codespell.yaml

@@ -0,0 +1,28 @@
+---
+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@v3
+      - name: Codespell
+        uses: codespell-project/actions-codespell@v2
+        with:
+          check_filenames: true
+          # When using this Action in other repos, the --skip option below can be removed
+          skip: "*.excalidraw,*.git,*.png,*.jpg,*.svg,go.mod,go.sum"
+        continue-on-error: true # The PR checks will not fail, but the possible spelling issues will still be reported for review and correction
+