docs(contributing): enhance documentation with note formatting and additional command

[brysonbw]

Summary

Changes

• Edit CONTRIBUTING.md doc
  • Convert the note to a proper Markdown note
  • Add cp command for copying .env.example to .env for convenience

Fixes #(issue)

• No issue/ticket

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• Other: ___________

Testing

Documentation change: No testing

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[cursor]

PR Summary

Low Risk
Low risk documentation-only changes; no runtime behavior is affected.

Overview
Updates .github/CONTRIBUTING.md to convert the issue-labeling reminder into a proper Markdown admonition ([!NOTE]) for better rendering.

Also adds an explicit cp .env.example .env command to the manual setup instructions to make environment setup more copy/paste friendly.

^{Written by Cursor Bugbot for commit 5feccdd. This will update automatically on new commits. Configure here.}

[vercel]

@brysonbw is attempting to deploy a commit to the Sim Team on Vercel.

A member of the Team first needs to authorize it.

[greptile-apps]

Greptile Summary

This PR makes two small improvements to CONTRIBUTING.md: it converts a legacy bold-note pattern (> **Note:** ...) to GitHub's native admonition callout syntax (> [!NOTE]), and adds a cp .env.example .env bash snippet beneath the existing "Copy .env.example to .env" bullet, making the local setup steps more copy-paste friendly.

• The > [!NOTE] callout syntax is correct GitHub Flavored Markdown and will render with a highlighted note block on GitHub.
• The added cp command is accurate given that the preceding step already changes into apps/sim, so the relative path is correct.
• The new code block is indented with 6 spaces while the adjacent code block immediately above it (cd apps/sim) uses 5 spaces — this is a trivial inconsistency that does not affect rendering but could be harmonised for consistency.

Confidence Score: 5/5

• This PR is safe to merge — it is a purely additive documentation improvement with no code changes.
• Only a single Markdown file is changed with two well-scoped additions (admonition syntax update and a convenience shell command). There are no logic, security, or correctness issues; the one minor inconsistency (indentation difference between adjacent code fences) does not affect rendering or correctness.
• No files require special attention.

Important Files Changed

Filename	Overview
.github/CONTRIBUTING.md	Documentation update converting a legacy note format to GitHub's admonition syntax and adding a cp .env.example .env convenience command; no logic issues, minor indentation inconsistency between neighboring code blocks (5 vs 6 spaces) that doesn't affect rendering.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Clone repository & bun install] --> B[cd apps/sim]
    B --> C[cp .env.example .env]
    C --> D[Configure required variables\nDATABASE_URL, BETTER_AUTH_SECRET,\nBETTER_AUTH_URL]
    D --> E[bunx drizzle-kit push]
    E --> F[bun run dev:full]
    F --> G[App + Realtime socket server running]

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_{Last reviewed commit: 5feccdd}