Rename nodejs.yml to main.yml

.github/workflows/main.yml

@@ -0,0 +1,12 @@
+name: Node CI
+on: [push]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-node@v1
+      with:
+        node-version: 12
+    - run: npm install
+    - run: npm test