Create a GitHub Actions workflow to run tests on push and pull request events

* Use `actions/checkout@v2` to check out the repository
* Use `actions/setup-node@v2` to set up Node.js
* Run `npm install` to install dependencies
* Run `npm test` to execute tests

Author: milewski

.github/workflows/test.yml

@@ -0,0 +1,27 @@
+name: Node.js CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Setup Node.js
+      uses: actions/setup-node@v2
+      with:
+        node-version: '14'
+
+    - name: Install dependencies
+      run: npm install
+
+    - name: Run tests
+      run: npm test