Update readme, add badges

[andreibancioiu]

No description provided.

[Copilot]

Pull Request Overview

This PR enhances the project README by adding status badges, updating the supported-currency description, and clarifying validation instructions.

• Added CI, build, coverage, and DeepWiki badges at the top
• Updated the currency support line to include custom fungible ESDTs
• Expanded validation instructions to reference system tests

Comments suppressed due to low confidence (2)

README.md:6

• [nitpick] The “Ask DeepWiki” badge may be unfamiliar to readers; consider adding a brief note or tooltip explaining what DeepWiki is and how it benefits the project.

[![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/multiversx/mx-chain-rosetta)

README.md:234

• [nitpick] The display text for the GitHub link is all lowercase; updating it to “MultiversX/mx-chain-rosetta-checks” will match the actual repository casing and avoid confusion.

In order to validate the Rosetta implementation using `mesh-cli`, follow [multiversx/mx-chain-rosetta-checks](https://github.com/multiversx/mx-chain-rosetta-checks) or the **system tests** section (below).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.64%. Comparing base (bc2a38b) to head (43261e1).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #135   +/-   ##
=======================================
  Coverage   61.64%   61.64%           
=======================================
  Files          48       48           
  Lines        3791     3791           
=======================================
  Hits         2337     2337           
  Misses       1302     1302           
  Partials      152      152           

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