add spellcheck

Author: jwindhager

.codespellrc

@@ -0,0 +1,2 @@
+[codespell]
+skip = .github,.codespellrc

.github/workflows/codespell.yml

@@ -0,0 +1,14 @@
+name: codespell
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+jobs:
+  codespell:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: codespell-project/actions-codespell@v2