build: setup GitHub CI

Author: Krinkle

.github/workflows/CI.yaml

@@ -0,0 +1,31 @@
+name: CI
+on:
+  - push
+  - pull_request
+
+jobs:
+
+  test:
+    strategy:
+      matrix:
+        include:
+          - node: 10.x
+          - node: 12.x
+          - node: 14.x
+          - node: 16.x
+          - node: 18.x
+          - node: 20.x
+
+    name: Node ${{ matrix.node }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+
+      - run: npm install
+
+      - run: npm test

.gitignore

@@ -1,3 +1,4 @@
-.DS_Store
-node_modules
-coverage
+/.DS_Store
+/node_modules
+/coverage
+/package-lock.json