codespell: workflow, config + 1 single uno only typo fixed! (#426)

* Add github action to codespell main on push and PRs

* Add rudimentary codespell config

* Add pre-commit definition for codespell

* Fixed a single typo codespell identifier

.github/workflows/codespell.yml

@@ -0,0 +1,22 @@
+---
+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