added macos napi test

.github/workflows/macos-napi.yml

@@ -0,0 +1,17 @@
+name: MacOS
+on: [push, pull_request]
+jobs:
+  test:
+    name: MacOS ${{ matrix.node-version }}
+    runs-on: macOS-latest
+    strategy:
+      matrix:
+        node-version: [12, 14, 16, 17]
+    steps:
+    - uses: actions/checkout@v1
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm i
+    - run: npm run mocha_napi