feat: init command options (#664)

* feat: add `--init-type` desc

* docs: update

* docs: update

* docs: update init

---------

Co-authored-by: Zoltan Kochan <z@kochan.io>

Author: btea

docs/cli/init.md

@@ -4,3 +4,16 @@ title: "pnpm init"
 ---
 
 Create a `package.json` file.
+
+## Options
+
+### --init-type <type\>
+
+* Default: **commonjs**
+* Type: **commonjs**, **module**
+
+Set the module system for the package.
+
+### --init-package-manager
+
+Pin the project to the current pnpm version by adding a "packageManager" field to package.json.