Add Rootstock DeFi Developer Guide

[Janhavi312003]

Title

Docs: Add Rootstock DeFi Developer Guide

Description

• Purpose:
  This PR adds a comprehensive Rootstock DeFi Developer Guide to help developers build and integrate DeFi applications on Rootstock. The ecosystem currently lacks a structured, beginner‑friendly resource covering the essential topics.

• Context:
  Rootstock’s DeFi space is expanding rapidly, but developers often have to piece together information from multiple sources. This guide consolidates practical workflows, example code, and best practices into one place.

• Changes:
  The following new files have been added under docs/04-resources/06-guides/defi-developer-guide/:

  • _category_.yml – defines the sidebar category
  • index.md – overview, prerequisites, and how to use the guide
  • 01-oracle-integration.md – Chainlink price feeds, VRF, and security
  • 02-amm-basics.md – building a simple constant‑product AMM
  • 03-token-standards.md – ERC‑20, ERC‑721, ERC‑4626, wRBTC, best practices
  • 04-security-patterns.md – reentrancy, access control, oracle manipulation, etc.

  All code examples have been tested on Rootstock testnet.

Screenshots/GIFs

N/A – this is a documentation change with no visual layout modifications.

Testing

• Verification:

  • Ran npm run build locally – no errors.
  • Manually checked all internal links (e.g., ./01-oracle-integration.md) to ensure they work.
  • Reviewed each page for formatting, broken code fences, and heading hierarchy.

• Output: (if you want to paste the build log, include it here, otherwise you can keep this line generic)

  $ npm run build
  ...

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