doc: Add github workflow config.

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: Build and Deploy Documents
+on:
+  push:
+    branches:
+      - master
+      
+jobs:
+  build-deploy:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@master
+
+    - name: Setup Node
+      uses: actions/setup-node@v1
+      with:
+        node-version: 10
+
+    - run: npm install
+    - run: npm run build
+
+    - name: Build and Deploy
+      uses: peaceiris/actions-gh-pages@v2.5.0
+      env:
+        ACTIONS_DEPLOY_KEY: ${{ secrets.ACTIONS_DEPLOY_KEY }}
+        PUBLISH_BRANCH: gh-pages
+        PUBLISH_DIR: ./typedoc