Add MockHero to MCP server list

## What is MockHero?

MockHero is a synthetic test data API that generates
realistic, relational fake data via a simple REST API.

**Why it belongs here:**
- 156 field types (names, emails, UUIDs, IBANs, etc.)
- 22 locales for internationalized data
- Relational data generation (users -> orders -> items)
- Sub-50ms response times
- Free tier: 1,000 records/day
- MCP server: npx @mockherodev/mcp-server

**Links:**
- Website: https://mockhero.dev
- MCP Server: https://github.com/mockherodev/mcp-server
- Docs: https://mockhero.dev/docs

README.md

@@ -827,6 +827,7 @@ Tools and integrations that enhance the development workflow and environment man
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+- [MockHero](https://github.com/mockherodev/mcp-server) - Generate realistic synthetic test data via MCP. 156 field types, 22 locales, relational data, sub-50ms responses. Free tier: 1,000 records/day. 🏠
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