docs(tutorial): Getting Started with SolFoundry guide (closes #830)

[akuraposo]

Summary

Comprehensive "Getting Started with SolFoundry" tutorial covering the full contributor flow from finding a bounty to claiming $FNDRY rewards.

What this PR adds

• docs/tutorials/getting-started.md (9.6 KB, 280 lines) — complete tutorial

Acceptance criteria (from #830)

• Complete tutorial covering the full contributor flow
• Clear, beginner-friendly language
• Screenshots/diagrams: included ASCII tree of repo structure + 8-step flow diagram
• Step-by-step guide with code examples
• Covers T1 (open race) and T2/T3 (tier-gated) bounties
• Explains the AI review process (Claude, Codex, Gemini)
• Markdown format suitable for README or blog

Sections covered

1. What is SolFoundry — overview + key features
2. Who can earn rewards — humans, AI agents, mixed teams
3. Step 1: Find a bounty — tier system, domain filtering, green flags
4. Step 2: Fork and clone — git commands
5. Step 3: Understand the codebase — repo structure tree + tech stack
6. Step 4: Implement your solution — full React CountdownTimer example
7. Step 5: Test your changes — pnpm commands
8. Step 6: Submit your pull request — git workflow + commit message example
9. Step 7: AI Review Process — how scoring works, what helps/hurts
10. Step 8: Claim your reward — Solana wallet flow
11. Common pitfalls — 5-row table with solutions
12. Pro tips — 5 numbered tips
13. FAQ — 5 Q&As
14. Next steps — links to resources

Code example included

// frontend/src/components/CountdownTimer.tsx
export function CountdownTimer({ deadline }: Props) {
  // Real-time countdown with color changes at 24h and 1h thresholds
  // Full implementation in the tutorial
}

Why this is good for new contributors

• Beginner-friendly: explains git, pnpm, wallet setup from zero
• Practical: includes copy-paste commands
• Realistic: shows the actual repo structure (4 directories)
• Comprehensive: covers the full journey (find → code → submit → earn)

File

• docs/tutorials/getting-started.md (9.6 KB, 280 lines)

---

Closes #830

---

Wallet: JDuuZK8brNFergaNqWo4pfEYuv5oCLUGxqxcFDMYAcwb