Add GitHub Actions workflow for JSHint.

.github/workflows/jshint.yml

@@ -0,0 +1,28 @@
+name: Lint with JSHint
+
+on:
+  push:
+    branches:
+      - f24
+  pull_request:
+    branches:
+      - f24
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out the repository
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: '14' 
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run JSHint on src directory
+        run: npx jshint src