Electron Plugin documentation

### Issue Type

- [ ] Bug Report
- [ x] Feature Request
- [ ] Support Question

## Description

Just reading the announcement at https://cordova.apache.org/announcements/2021/09/06/cordova-electron-release-3.0.0.html..

```
Cordova Plugin Support
In the earlier releases of Cordova Electron, we didn't have a proper plugin system in place.
```

Was there going to be some new documentation on how to use this?

eg I have an Ionic/Cordova application where I wish to add Electron (to take over from the disbanded Windows UWP), but I need to support plugins such as File, email, SQLite etc

Thankyou

Start with the Cordova Electron 3.0.0 announcement linked in the issue, then inspect the current Cordova Electron documentation and plugin guidance. Define which plugins are supported and document how an Ionic/Cordova application uses them with Electron, including the File, email, and SQLite examples if applicable.

Written by the indexing model from the issue text.