[Feature Request] Set up Copilot instructions

### Summary Configure instructions for this repository as documented in [Best practices for Copilot coding agent in your repository](https://gh.io/copilot-coding-agent-tips). ### Detailed Description Please add the following requirements to the instruction: 1. Prefer semantic commit messages for the PR titles and commit messages. 2. Prefer uv to install Python dependencies like dpgen. ### Further Information, Files, and Links <Onboard this repo>