Add MCPHub to the list of clients at modelcontextprotocol.io

[disusered]

I was reading the MCP documentation and saw a page with a list of clients, notably MCPHub was missing. I opened a PR to have it included, I got most of the copy from the README but wanted to share it here in case any edits are requested.

modelcontextprotocol/modelcontextprotocol#355

As an aside, thank you for the work you've put into this tool!

[ravitemer]

Thank you @disusered ! Much appreciated!