Multiple plugins support?

[koba04]

Currently, create-plugin creates a project for a plugin so we have to create projects per plugin.
It's a bit messy.

Does it seem to be nice if create-plugin can support multiple plugins like this?

├── node_modules
├── package-lock.json
├── package.json
├── private.ppk
├── scripts
├── plugin-a
│    ├── css
│    ├── html
│    ├── image
│    ├── js
│    └── manifest.json
└── plugin-b
     ├── css
     ├── html
     ├── image
     ├── js
     └── manifest.json