docs: Add Hashnode MCP Server to README

[LoNeWoLf26548]

Description

Server Details

• Server: Hashnode MCP Server
• Changes to: README.md (add new community server reference)

Motivation and Context

This change adds visibility for the Hashnode MCP Server, allowing the MCP community to discover and use a server that provides robust capabilities for managing blog posts and content on Hashnode. It expands the ecosystem of available MCP servers and demonstrates integration with LLM clients such as Claude Desktop.

How Has This Been Tested?

The Hashnode MCP Server has been tested with Claude Desktop and the official MCP Python client to ensure proper functionality for managing blog posts.

Breaking Changes

No breaking changes. This is an addition to the community servers list. Users who wish to use the Hashnode MCP Server will need to add its configuration to their MCP client.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation update

Checklist

• [x] I have read the MCP Protocol Documentation
• [x] My changes follows MCP security best practices
• [x] I have updated the server's README accordingly
• [x] I have tested this with an LLM client
• [x] My code follows the repository's style guidelines
• [x] New and existing tests pass locally
• [x] I have added appropriate error handling
• [x] I have documented all environment variables and configuration options

Additional context

The Quickstart includes setup instructions and example usage with Claude Desktop.