Add CodeQL workflow

Update README

Update Node.js workflow

Fix tests

.github/workflows/codeql-workflow.yml

@@ -0,0 +1,25 @@
+name: CodeQL Workflow
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 15 * * 6'
+jobs:
+  codeql:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 2
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v1
+        with:
+          config-file: ./.github/codeql/codeql-configuration.yml
+          languages: javascript
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@v1
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v1