Add unit test runner

.github/workflows/run-tests.yml

@@ -0,0 +1,23 @@
+name: Wordlike Unit Tests
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 16.x
+
+      - name: Run tests
+        run: npm install && npx jest