[Good First Issue] 🍙 Add new Etiquette Tip 68 - Beginner-Friendly Contribution (good-first-issue, <1 min, no setup)

## 🟢 Good First Issue: Add Etiquette Tip #68 — Beginner-Friendly Open Source Contribution ![Time: 🟢 **No prerequisites needed!** You don't need to clone the repo, install anything, or write code.

> This entire contribution can be done from your browser in under 60 seconds. **Labels:** good first issue, help wanted, hacktoberfest **Language:** JSON (no coding required) **Time:** **Note:** 共同浴場の基本ルール。 ### 📝 Instructions 1. Star our repo ⭐

2. Fork our repo 🍴

3. Open [`community/content/japanese