Added github action for CI. (#9)

.github/workflows/ci.yaml

@@ -0,0 +1,44 @@
+name: Continuous Integration
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Install Node.js
+      uses: actions/setup-node@v1
+      with:
+        node-version: 10.x
+    - run: npm install
+    - name: Run tests
+      uses: GabrielBB/xvfb-action@v1.2
+      with:
+        run: npm test
+
+# jobs:
+#   tests:
+#     runs-on: ubuntu-latest
+#     steps:
+#     - uses: actions/checkout@v2
+
+#     - name: Start xvfb
+#       run: /usr/bin/Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
+
+#     - name: install nodejs dependencies
+#       run: npm install
+
+#     - name: compile the project
+#       run: npm run compile
+
+#     - name: Test the extension via shell script
+#       run: bash tests/e2e.sh