Add continuous integration

.github/workflows/ci.yml

@@ -0,0 +1,14 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
+      with:
+        node-version: '14'
+    - run: npm install
+    - run: npm test