docs: add commands

docs/cli/src/cmd/README.md

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+# Commands
+
+In this chapter we will introduce all `dioxus-cli` commands.
+
+> you can also use `dioxus --help` to get cli help info.
+
+```
+dioxus 
+Build, bundle, & ship your Dioxus app
+
+USAGE:
+    dioxus [OPTIONS] <SUBCOMMAND>
+
+OPTIONS:
+    -h, --help    Print help information
+    -v            Enable verbose logging
+
+SUBCOMMANDS:
+    build        Build the Rust WASM app and all of its assets
+    clean        Clean output artifacts
+    config       Dioxus config file controls
+    create       Init a new project for Dioxus
+    help         Print this message or the help of the given subcommand(s)
+    serve        Build, watch & serve the Rust WASM app and all of its assets
+    translate    Translate some source file into Dioxus code
+```

docs/cli/src/cmd/build.md

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+# Build
+
+`dioxsu build` command can help you `pack & build` a dioxus project.
+
+```
+dioxus-build 
+Build the Rust WASM app and all of its assets
+
+USAGE:
+    dioxus build [OPTIONS]
+
+OPTIONS:
+        --example <EXAMPLE>      [default: ""]
+        --platform <PLATFORM>    [default: "default_platform"]
+        --release                [default: false]
+```
+
+you can use this command to build project to `out_dir` :
+
+```
+dioxus build --release
+```
+
+## Target platform
+
+use option `platform` choose build target platform:
+
+```
+# for desktop project
+dioxus build --platform desktop
+```
+
+`platform` only supports `desktop` & `web`.
+
+```
+# for web project
+dioxus build --platform web
+```
+
+## Build Example
+
+you can use `--example {name}` to build a example code.
+
+```
+# build `example/test` code
+dioxus build --exmaple test
+```

docs/cli/src/cmd/serve.md

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+# Serve
+
+`dioxsu serve` can start a dev server (include hot-reload tool) to run the project.
+
+```
+dioxus-serve 
+Build, watch & serve the Rust WASM app and all of its assets
+
+USAGE:
+    dioxus serve [OPTIONS]
+
+OPTIONS:
+        --example <EXAMPLE>      [default: ""]
+        --platform <PLATFORM>    [default: "default_platform"]
+        --release                [default: false]
+```
+
+you can use this command to build project and start a `dev server` :
+
+```
+dioxus serve
+```
+
+## Target platform
+
+use option `platform` choose build target platform:
+
+```
+# for desktop project
+dioxus serve --platform desktop
+```
+
+`platform` only supports `desktop` & `web`.
+
+`dev-server` only for `web` project.
+
+```
+# for web project
+dioxus serve --platform web
+```
+
+## Serve Example
+
+you can use `--example {name}` to start a example code.
+
+```
+# build `example/test` code
+dioxus serve --exmaple test
+```