add command guide in docs

website/docs/guide/commands/plugin-pack.md

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+---
+sidebar_position: 500
+draft: true
+---
+
+# plugin pack
+
+The `plugin` command allows you to packaging kintone plugin project.
+
+:::experimental
+
+This feature is under early development.
+
+:::
+
+## Example
+
+```shell
+cli-kintone plugin pack \
+  --input ./src \
+  --output ./dist \
+  --private-key ./key.ppk
+```
+
+## Options
+
+See [Options](/guide/options) page for common options.
+
+| Option            | Required | Description                                                                                    |
+| ----------------- | -------- | ---------------------------------------------------------------------------------------------- |
+| `--input`         | Yes      | The input plugin project directory.                                                            |
+| `--output`        |          | The destination path of generated plugin file.<br/>Default to plugin.zip on current directory. |
+| `--private-key  ` |          | The path of private key file<br/>If omitted, new private key will be generated.                |