chore(ci): add github workflows for testing

.github/workflows/ci.yml

@@ -0,0 +1,16 @@
+name: Install and test sparql-transformer
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout repo
+        uses: actions/checkout@v3
+      - name: use node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: "18.x"
+      - run: npm ci
+      - run: npm test