Add documentation on creating a mod and the fields a mod contains

[EmeraldLoc]

Title. You can view the doc file here

https://github.com/EmeraldLoc/sm64coopdx/blob/docs-mod-stuff/docs/lua/guides/creating-mod.md

Also minority adjusts vscode doc to have lua color highlighting

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Run ID: 36310fb7-943c-4c68-92c3-7d381057da98

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Reviewing files that changed from the base of the PR and between daf2b22 and 8e54699.

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• docs/lua/guides/creating-mod.md

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📝 Walkthrough

Walkthrough

A new documentation page docs/lua/guides/creating-mod.md is added, providing a step-by-step guide for creating Lua mods in sm64coopdx. It covers navigating to the mods directory, choosing between file mods and folder mods, platform-specific .lua file creation, setting up main.lua for folder mods, and configuring comment-based metadata fields. Two bullet links to this guide are added in docs/lua/lua.md under the Tips and Guides sections. A code-fence formatting error in docs/lua/guides/vs-code-setup.md is also corrected.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding documentation on creating a mod and its fields, which is the primary purpose of the PR.
Description check	✅ Passed	The description is related to the changeset, mentioning the new documentation file and the VS Code documentation adjustment, though it could be more detailed.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/lua/guides/creating-mod.md`:
- Line 31: Apply the following textual corrections to the documentation:
capitalize "Windows" as a proper noun where it appears in the platform
instructions section, add hyphens to compound adjectives such as "worst-case
scenario" and "opt-in system" to follow professional documentation standards,
and fix the grammatical error in the categories description by replacing "Do not
categories are all lowercase" with "Categories are all lowercase" or "Note that
categories are all lowercase" for proper sentence structure.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: faed2533-07cd-452e-a6c1-e60441cab12d

📥 Commits

Reviewing files that changed from the base of the PR and between 94c163c and 038fb33.

📒 Files selected for processing (1)

• docs/lua/guides/creating-mod.md