Add missing Stellar & Stylus links to README (#520)

Author: 0xNeshi

README.md

@@ -2,6 +2,8 @@
 
 [![Solidity NPM Package](https://img.shields.io/npm/v/@openzeppelin/wizard?color=%234e5de4&label=%40openzeppelin%2Fwizard)](https://www.npmjs.com/package/@openzeppelin/wizard)
 [![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)
 [![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.
@@ -32,3 +34,5 @@ The following describes how to use the Contracts Wizard programmatic API in your
 
 - [Contracts Wizard API for Solidity](packages/core/solidity/README.md)
 - [Contracts Wizard API for Cairo](packages/core/cairo/README.md)
+- [Contracts Wizard API for Stellar](packages/core/stellar/README.md)
+- [Contracts Wizard API for Stylus](packages/core/stylus/README.md)