github/copilot.vim ? reverse-engineered prompt

Build me a GitHub Copilot plugin for Vim and Neovim that feels simple to install and use. I want it to let users connect their Copilot account, run a setup command, and then show AI coding suggestions right inside the editor while they type. The suggestions should appear inline, and pressing Tab should accept them. Make it work in both Vim and Neovim, and keep the experience lightweight so it fits naturally into a normal editor workflow.

Please include clear setup and help docs too, so someone can get started without much fuss. If you need current details from the official Copilot docs or plugin install guides, look them up online and follow the latest recommended approach.