Add: github action for linting

.github/workflows/lint.yml

@@ -0,0 +1,13 @@
+name: Lint
+
+on: [push]
+
+jobs:
+  eslint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: stefanoeb/eslint-action@1.0.2
+        working-directory: ./js
+        with:
+          files: js/packages