docs: Add docs for Github Copilot models

copilot.md

@@ -0,0 +1,35 @@
+---
+parent: Connecting to LLMs
+nav_order: 570
+---
+
+# Github Copilot
+
+Aider can connect to models provided by Github Copilot.
+You will need to have a Github Copilot subscription.
+
+To use Github Copilot models with Aider, you need to specify the model using the `github_copilot/` prefix.
+
+```bash
+aider --model github_copilot/claude-3.7-sonnet-thought
+```
+
+{: .tip }
+> If you have not authenticated with Github Copilot before, the first time you run Aider with the `github_copilot` model, you will be prompted to authenticate with Github Copilot using device code authentication. Follow the instructions in the terminal to authenticate.
+
+## Available Models
+
+To see the models available via Github Copilot, run:
+
+```bash
+aider --list-models github_copilot/
+```
+
+Make sure you have access to these models through your Github Copilot subscription before attempting to use them with Aider.
+
+# More info
+
+For more information on Github Copilot, refer to the [official Github Copilot documentation](https://docs.github.com/en/copilot).
+
+Also, see the
+[litellm docs on Github Copilot](https://litellm.vercel.app/docs/providers/github_copilot).