Github actions for deploy doc page (#322)

add docs github page

.github/workflows/docs.yaml

@@ -0,0 +1,16 @@
+name: Publish docs
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: '3.9'
+      - run: pip install mkdocs mkdocs-material
+      - run: mkdocs gh-deploy --force