docs: Add CLI resolution example to README

[jadonamite]

Overview

This PR adds a "CLI Quick Start" section to the README.md.

It provides a copy-pasteable example of how to resolve a Basename (e.g., jesse.base.eth) directly from the command line using cast.

Motivation & Context

The Problem:
Currently, the repository documents the smart contracts well but lacks a simple "Hello World" entry point for developers. To resolve a name manually, a developer must currently:

1. Dig through the codebase to find the L2 Resolver deployment address.
2. Manually construct the calldata.

The Solution:
By providing a pre-built cast command with the correct Mainnet L2 Resolver address (0xC6d5...3BCD), we significantly improve the Developer Experience (DX). This allows users to verify names and query the registry without writing any Solidity or JS code.

Changes

• Added ### CLI Resolution Example to the Usage section of README.md.
• Verified the L2 Resolver address (0xC6d566A56A1aFf6508b41f6c90ff131615583BCD) against the official deployments.

Checklist

• Documentation updated.
• Command verified on Base Mainnet.

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[jadonsunshine]

Resolving a Basename directly from the CLI using Foundry.

[cb-heimdall]

Review Error for jadonsunshine @ 2025-12-29 01:34:15 UTC
User failed mfa authentication, either user does not exist or public email is not set on your github profile. \ see go/mfa-help

[jadonsunshine]

Resolving a Basename directly from the CLI using Foundry.

[cb-heimdall]

Review Error for jadonsunshine @ 2025-12-29 01:34:56 UTC
User failed mfa authentication, either user does not exist or public email is not set on your github profile. \ see go/mfa-help