feat(client) add client

client/README.md

@@ -0,0 +1,30 @@
+## Module Structure
+
+```shell
+.
+├── README.md
+├── cli
+├── content
+│   ├── pages
+│   │   └── about
+│   │       └── <static_page>.md
+│   └── posts
+│       └── <year>
+│           └── <identifier>
+│               ├── assets
+│               │   └── <assets>
+│               ├── translate_<lang>.md
+│               └── index.md
+├── requirements.txt
+├── templates
+│   ├── <template>.py
+│   └── ...
+└── utils
+    └── ...
+```
+
+### About `posts`
+
+- Will render to `https://<DOMAIN>/blog/post/<identifier>`.
+- Files under `assets/` (where images etc. located) should be pushed to OSS.
+- For identifiers, use prefix `-` to indicate private (hidden) visibility. EX: `-hello-world`.