Add a README.md section about using EELS with Monad

[pdobacz]

Add a simple getting started to filling spec tests for Monad into the README.md. Requested by @DanielVF

It duplicates a bit of upstream documentation (which is also a bit scattered RN), but should provide a primer for anyone wanting to clone the repo and fill themselves.

[greptile-apps]

Greptile Summary

This PR adds a Monad-specific "Getting Started" section at the top of the README.md, providing documentation for developers wanting to use this execution-specs fork with Monad. It covers:

• Installation steps using uv and Python 3.12
• How to fill (generate) spec test fixtures for Monad hardforks
• Explanation of key uv run fill CLI flags (-m, --from, --until, --chain-id, -n auto)
• Notes on test organization and gotchas around Ethereum-only features, upstream sync, and new fork creation

Issues found:

• Typo: "invokation" should be "invocation" (line 53)
• References monad_nine test directory which does not yet exist in the repo

Confidence Score: 4/5

• This PR is safe to merge — it only adds documentation to the README with no code changes.
• Documentation-only change with minor issues (typo and a reference to a not-yet-existing directory). No code logic is affected. All referenced file paths, fork identifiers, and CLI flags were verified against the codebase.
• No files require special attention — only README.md was changed with documentation additions.

Important Files Changed

Filename	Overview
README.md	Adds a Monad-specific getting started section covering installation, test filling, CLI flags, and gotchas. Contains a typo ("invokation") and references a monad_nine test directory that doesn't exist yet.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Clone repo & install uv] --> B[uv python install 3.12 & uv sync]
    B --> C[uv run fill with flags]
    C --> D{Test Discovery}
    D --> E[tests/monad_eight/]
    D --> F[tests/prague/eip7702_set_code_tx/]
    D --> G[Other upstream test dirs]
    E --> H[Python EELS fills tests]
    F --> H
    G --> H
    H --> I[JSON fixtures in fixtures/]
    I --> J[Consumed by monad client]

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