Adding Copilot Chat support

[DanBradbury]

Knowing that there are no plans to accept contributions at this time I'll go ahead and create my own copilot-chat.vim plugin with the overall goal of merging the work back into this project if there is ever a desire.

Features

Visual selection add to chat window

Model selection

copilot-chat.vim

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At the moment we are not accepting contributions to the repository.

[github-actions]

At the moment we are not accepting contributions to the repository.

Feedback for Copilot.vim can be given in the Copilot community discussions.

[yermulnik]

@DanBradbury How to operate the chat? I can't seem to figure out how to submit requests to Copilot 😢 nvm. it's just that <buffer> isn't working for me in nnoremap <buffer> <leader>cs :SubmitChatMessage<CR> (w/o it I can use <leader>cs to submit w/o issues).

[DanBradbury]

@DanBradbury How to operate the chat? I can't seem to figure out how to submit requests to Copilot 😢 nvm. it's just that <buffer> isn't working for me in nnoremap <buffer> <leader>cs :SubmitChatMessage<CR> (w/o it I can use <leader>cs to submit w/o issues).

I'll be working on updating the documentation over the next few days. This is just the most basic PoC to use as a starting point m