add docs ci

.github/workflows/docs.yml

@@ -0,0 +1,17 @@
+name: Couscous GithubPage
+
+on:
+  push:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v1
+
+      - uses: CouscousPHP/GitHub-Action@v1
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./.couscous/generated