Add wRTC Quickstart Documentation

[WYSIATI]

Summary

Adds comprehensive wRTC quickstart documentation as requested in #58.

What's Included

• ✅ Anti-scam checklist with canonical mint address
• ✅ Step-by-step Raydium swap instructions
• ✅ Bridge to BoTTube guide
• ✅ Withdraw back to wRTC procedure
• ✅ Quick reference table
• ✅ Troubleshooting section

Files Added

• docs/wrtc.md - Complete quickstart guide

Checklist

• Doc is readable without insider knowledge
• Includes copy-pastable steps
• Anti-scam warnings prominent
• All URLs verified
• Links from README (can be added if needed)

Closes #58

Ready for review! 🚀

[Scottcjn]

Thanks for the submission. Closing this as duplicate/noise for payout triage.

Why: this overlaps existing wRTC onboarding work already under review, and several quickstart PRs reference bounty #58 which is now a red-team consensus bounty (not docs).

How to get paid next round:

1. Submit a focused follow-up diff that adds missing proof/screenshots to the accepted onboarding doc path
2. Or pick another active bounty with distinct scope: feat: Add BoTTube <-> RustChain Bridge Daemon #99 (challenge), feat: Add Windows Installer for RustChain Miner #100 (discovery), fix(security): harden /wallet/transfer/signed validation & error handling #103 (X + BoTTube), fix(explorer): prevent XSS in dashboard rendering #124 (profile avatar+bio), [BOUNTY] Security Red Team - Vulnerability Scanner (#57) #72 docs items not yet covered
3. Include claim format + RTC wallet + verification evidence in the bounty issue

Keep participating. Quality submissions that meet scope and proof requirements are paid.