build: add CI configuration for Windows

Added windows-2016 as virtual environment.

PR-URL: nodejs/node-addon-api#948
Reviewed-By: Michael Dawson <midawson@redhat.com>
Reviewed-By: Gabriel Schulhof <gabriel.schulhof@intel.com>

.github/workflows/ci-win.yml

@@ -0,0 +1,31 @@
+name: Node.js CI Windows Platform
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    timeout-minutes: 30
+    strategy:
+      matrix:
+        node-version:  [10.x, 12.x, 14.x, 15.x]
+        os:
+          - windows-latest
+          - windows-2016
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v2.1.5
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: Check Node.js installation
+      run: |
+        node --version
+        npm --version
+    - name: Install dependencies
+      run: |
+        npm install
+    - name: npm test
+      run: |
+        npm run pretest -- --verbose
+        node test

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: Node.js CI
+name: Node.js CI Unix Platform
 
 on: [push, pull_request]