add github workflow

.github/workflows/main.yml

@@ -0,0 +1,20 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+  audit:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [14.x]
+
+    steps:
+    - uses: actions/checkout@v2.3.2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v2.1.1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: yarn install
+    - run: yarn run startandtest