Add shields for MCP packages (#579)

Author: ericglau

README.md

@@ -4,6 +4,7 @@
 [![Cairo NPM Package](https://img.shields.io/npm/v/@openzeppelin/wizard-cairo?color=%23e55233&label=%40openzeppelin%2Fwizard-cairo)](https://www.npmjs.com/package/@openzeppelin/wizard-cairo)
 [![Stellar NPM Package](https://img.shields.io/npm/v/@openzeppelin/wizard-stellar?color=%23e55233&label=%40openzeppelin%2Fwizard-stellar)](https://www.npmjs.com/package/@openzeppelin/wizard-stellar)
 [![Stylus NPM Package](https://img.shields.io/npm/v/@openzeppelin/wizard-stylus?color=%23e55233&label=%40openzeppelin%2Fwizard-stylus)](https://www.npmjs.com/package/@openzeppelin/wizard-stylus)
+[![MCP NPM Package](https://img.shields.io/npm/v/@openzeppelin/wizard-mcp?label=%40openzeppelin%2Fwizard-mcp)](https://www.npmjs.com/package/@openzeppelin/wizard-mcp)
 [![Netlify Status](https://api.netlify.com/api/v1/badges/ca9b53e1-44eb-410d-aac7-31b2f5399b68/deploy-status)](https://app.netlify.com/sites/openzeppelin-contracts-wizard/deploys)
 
 Contracts Wizard is a web application to interactively build a contract out of components from OpenZeppelin Contracts. Select the kind of contract that you want, set your parameters and desired features, and the Wizard will generate all of the code necessary. The resulting code is ready to be compiled and deployed, or it can serve as a starting point and customized further with application specific logic.

packages/common/README.md

@@ -1,3 +1,5 @@
 # @openzeppelin/wizard-common
 
+[![NPM Package](https://img.shields.io/npm/v/@openzeppelin/wizard-common)](https://www.npmjs.com/package/@openzeppelin/wizard-common)
+
 Common library for OpenZeppelin Contracts Wizard components. Used internally.

packages/mcp/README.md

@@ -1,5 +1,7 @@
 # OpenZeppelin Contracts Wizard MCP Server
 
+[![NPM Package](https://img.shields.io/npm/v/@openzeppelin/wizard-mcp)](https://www.npmjs.com/package/@openzeppelin/wizard-mcp)
+
 A Model Context Protocol (MCP) server that allows AI agents to generate smart contracts using the [OpenZeppelin Contracts Wizard](https://wizard.openzeppelin.com/).
 
 > [!WARNING]