docs: add composition section

apps/v4/content/docs/components/base/command.mdx

@@ -96,6 +96,24 @@ import {
 </Command>
 ```
 
+## Composition
+
+Use the following composition to build a `Command`:
+
+```text
+Command
+├── CommandInput
+└── CommandList
+    ├── CommandEmpty
+    ├── CommandGroup
+    │   ├── CommandItem
+    │   └── CommandItem
+    ├── CommandSeparator
+    └── CommandGroup
+        ├── CommandItem
+        └── CommandItem
+```
+
 ## Examples
 
 ### Basic