feat: adding information about Markdown

[CBID2]

Description

This pull request adds a new section about Markdown and includes a reference to the Style Guide in the Pizza Verse repository so contributors can see how it's used in real-time.

What type of PR is this? (check all applicable)

• [X] 🍕 Feature
• [ ] 🐛 Bug Fix
• [X] 📝 Documentation Update
• [ ] 🎨 Style
• [ ] 🧑‍💻 Code Refactor
• [ ] 🔥 Performance Improvements
• [ ] ✅ Test
• [ ] 🤖 Build
• [ ] 🔁 CI
• [ ] 📦 Chore (Release)
• [ ] ⏩ Revert

Related Tickets & Documents

Relates to Issue #7 in the Pizza Verse repository.

Mobile & Desktop Screenshots/Recordings

Added tests?

• [ ] 👍 yes
• [X] 🙅 no, because they aren't needed
• [ ] 🙋 no, because I need help

Added to documentation?

• [ ] 📜 README.md
• [ ] 📓 docs.opensauced.pizza
• [ ] 🍕 dev.to/opensauced
• [ ] 📕 storybook
• [X] 🙅 no documentation needed

[optional] Are there any post-deployment tasks we need to perform?

[optional] What gif best describes this PR or how it makes you feel?

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