test: add vitest tests and GitHub Actions CI (#2)

* test: add vitest tests and GitHub Actions CI

- Add basic tests for createBundle function
- Test recursive scanning, pretty printing, font metadata
- CI runs on Node 18, 20, 22

* chore: add Anton font license (OFL)

Author: pweiskircher

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    
+    strategy:
+      matrix:
+        node-version: [18, 20, 22]
+    
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+      
+      - name: Install dependencies
+        run: npm ci
+      
+      - name: Run tests
+        run: npm test