Added cSpell command and GitHub action

.github/workflows/cspell.yaml

@@ -0,0 +1,30 @@
+# Workflow to run cSpell on entire monorepo
+
+name: cSpell
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches:
+      - master
+      - release/*
+
+jobs:
+  cspell:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v2
+
+      - name: Configure git
+        run: |
+          git config --local user.email [email protected]
+          git config --local user.name imodeljs-admin
+
+      - name: Setup node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18
+
+      - name: Rush cspell
+        run: node common/scripts/install-run-rush.js cspell

common/autoinstallers/rush-cspell/package.json

@@ -0,0 +1,8 @@
+{
+  "name": "rush-cspell",
+  "version": "1.0.0",
+  "private": true,
+  "dependencies": {
+    "cspell": "^8.16.0"
+  }
+}