Add COTI-Ethers Web3modal Cursor Rule to Directory

[upendra-eth]

Summary

This PR adds a new rule for integrating the coti-ethers library with Web3modal in the directory. The rule provides essential context, onboarding flow, smart contract integration examples, and best practices for building applications on the COTI blockchain using TypeScript/JavaScript.

Details

• Adds coti-ethers.ts to packages/data/src/rules/
• Includes:
  • Overview of the coti-ethers library and its purpose
  • Onboarding flow for wallet connection and AES key management
  • Example code for user onboarding and smart contract integration
  • Best practices for secure and robust COTI-based application development
  • References to file structure and usage patterns

Motivation

This rule is intended to help developers onboard users and interact with COTI smart contracts securely and efficiently, following best practices and leveraging the coti-ethers library.

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