added CI workflow for running eslint

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+# Continuous Integration (CI) Workflow
+name: ci
+
+# See:
+# https://docs.github.com/en/actions/learn-github-actions/workflow-syntax-for-github-actions#on
+on:
+  pull_request:
+    branches:
+      - master
+  push:
+    branches:
+      - master
+
+jobs:
+  lint:
+    name: ESLint
+    runs-on: ubuntu-latest
+    steps:
+      # https://github.com/actions/checkout
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      # https://github.com/actions/setup-node
+      - name: Setup node
+        uses: actions/setup-node@v3
+        with:
+          # Use node LTS version 18 - https://github.com/actions/setup-node#supported-version-syntax
+          node-version: '18'
+          # Cache npm dependencies so they don't have to be downloaded next time - https://github.com/actions/setup-node#caching-packages-dependencies
+          cache: 'npm'
+
+      - name: Install node dependencies
+        #See: https://docs.npmjs.com/cli/v8/commands/npm-ci
+        run: npm ci
+
+      - name: Run ESLint
+        run: npm run lint