Create ESLint.yml

.github/workflows/ESLint.yml

@@ -0,0 +1,9 @@
+name: ESLint
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Run ESLint
+      run: npx eslint CookieMonster.js