Add TypeScript and EmDash Plugin badges to README

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jdevalk

README.md

@@ -4,6 +4,8 @@
 [![Lint](https://github.com/jdevalk/emdash-plugin-lettermint/actions/workflows/lint.yml/badge.svg)](https://github.com/jdevalk/emdash-plugin-lettermint/actions/workflows/lint.yml)
 [![npm](https://img.shields.io/npm/v/@jdevalk/emdash-plugin-lettermint)](https://www.npmjs.com/package/@jdevalk/emdash-plugin-lettermint)
 [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)
+[![TypeScript](https://img.shields.io/badge/TypeScript-5.0+-3178c6.svg)](https://www.typescriptlang.org/)
+[![EmDash Plugin](https://img.shields.io/badge/EmDash-plugin-orange.svg)](https://github.com/emdash-cms/emdash)
 
 [Lettermint](https://lettermint.co) email provider plugin for [EmDash CMS](https://emdashcms.com).