CI: Add a spelling check into CI

use codespell to make sure that everyone is aware of their bad spelling,
and make sure to point it out during the commit process.

Signed-off-by: Robin Getz <rgetz@mathworks.com>

.github/workflows/codespell.yml

@@ -0,0 +1,27 @@
+# GitHub Action to automate the identification of common misspellings in text files.
+# https://github.com/codespell-project/actions-codespell
+# https://github.com/codespell-project/codespell
+name: codespell
+on:
+  push:
+    branches:
+      - main
+      - '[0-9]+.x'
+  pull_request:
+    branches:
+      - main
+      - master
+
+permissions:
+  contents: read  #  to fetch code (actions/checkout)
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: codespell-project/actions-codespell@v1 # v1.0
+        with:
+          check_filenames: true
+          skip: .git,deps
+          ignore_words_file: .codespell-ignore.txt