Update docs.

.github/workflows/workflow.yml

@@ -0,0 +1,34 @@
+name: Main workflow
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: macOS-latest
+    timeout-minutes: 20
+    strategy:
+      matrix:
+        api-level: [21, 29]
+    steps:
+    - name: checkout
+      uses: actions/checkout@v1
+      with:
+        fetch-depth: 1
+
+    - name: build, test and lint
+      run: |
+        npm install
+        npm run build
+        npm run lint
+        npm test
+
+    - name: run action
+      uses: ./
+      with: 
+        api-level: ${{ matrix.api-level }}
+        target: default
+        abi: x86
+        headless: true