Prepare CLI for move into mainline

packages/cli/docs/src/cmd/serve.md

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+# Serve
+
+The `dioxus serve` can start a dev server with hot-reloading
+
+```
+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]
+        --hot-reload             [default: false]ß
+```
+
+You can use this command to build project and start a dev server:
+
+```
+dioxus serve
+```
+
+## Serve Example
+
+You can use the `example` option to serve a example:
+
+```
+# serve the `test` example
+dioxus serve --exmaple test
+```
+
+## Open Browser
+
+You can add the `--open` option to open system default browser when server startup:
+
+```
+dioxus serve --open
+```
+
+## RSX Hot Reloading
+
+You can add the `--hot-reload` flag to enable [rsx hot reloading](https://dioxuslabs.com/docs/0.3/guide/en/getting_started/hot_reload.html). This will allow you to reload some rsx changes without a full recompile:
+
+```
+dioxus serve --open
+```
+
+## Cross Origin Policy
+
+You can add the `cross-origin-policy` option to change cross-origin header to:
+
+```
+  Cross-Origin-Opener-Policy: same-origin
+  Cross-Origin-Embedder-Policy: require-corp
+```
+
+```
+dioxus serve --corss-origin-policy
+```