Add Runbear MCP client to README.md

[ssowonny]

Description

Add Runbear MCP client that enables connecting MCP servers to team chat platforms like Slack, Teams, and HubSpot.

Motivation and Context

Connecting MCP servers to everyday tools like Slack should be much easier. I'd love to guide the easiest way to introduce MCP servers to colleauges living in Slack.

How Has This Been Tested?

I've tested it by myself. I confirmed that it works with MCP servers across SSE, Streamable HTTP, OAuth, and API key.

Breaking Changes

No breaking changes.

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)
• Documentation update

Checklist

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

Additional context