docs: add gaming-oriented routing tutorial

[rustcult]

Background

鉴于DAE强大的分流能力以及强大的转发能力,为了充分利用其能力,本PR提供了一套在OpenWRT上使用DAE利用WireGuard隧道进行游戏加速的最简配置文件.

Checklist

• [ ] The Pull Request has been fully tested
• [ ] There's an entry in the CHANGELOGS
• [ ] There is a user-facing docs PR against https://github.com/daeuniverse/dae

Full Changelogs

• [Implement ...]

Issue Reference

Closes #[issue number]

Test Result