ci: add GH workflow for CI

Author: dominykas

.github/workflows/ci.yaml

@@ -0,0 +1,25 @@
+name: Node.js CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+
+  test:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [ 16, 14, 12, 10 ]
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm run test