Add Cheqd Official MCP Toolkit to readme

[sownak]

Description

Added official Cheqd MCP Toolkit to the Official Integrations. Alphabetic placement followed.

Server Details

• Server: N/A (Adding a link to README)
• Changes to: README.md (Official Integrations section)

Motivation and Context

Cheqd MCP Toolkit enables AI Agents to be trusted, verified, prevent fraud, protect your reputation, and more through cheqd’s Trust Registries and Credentials. This toolkit will allow Agents to create DID, even Issue Credentials and Hold Credentials in their local wallet.

How Has This Been Tested?

N/A - documentation change only

Breaking Changes

None

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