add cspell GH workflow

.github/workflows/spellcheck.yaml

@@ -0,0 +1,11 @@
+name: 'Check spelling'
+on: # rebuild any PRs and main branch changes
+ pull_request:
+ push:
+
+jobs:
+ spellcheck: # run the action
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@v4
+ - uses: streetsidesoftware/cspell-action@v5