Update clients.mdx

Add Postman

Author: DSchau

docs/clients.mdx

@@ -34,6 +34,7 @@ This page provides an overview of applications that support the Model Context Pr
 | [Microsoft Copilot Studio]                  | ❌          | ❌        | ✅      | ❌         | ❌    | Supports tools                                                              |
 | [OpenSumi][OpenSumi]                        | ❌          | ❌        | ✅      | ❌         | ❌    | Supports tools in OpenSumi                                                  |
 | [oterm][oterm]                              | ❌          | ✅        | ✅      | ✅         | ❌    | Supports tools, prompts and sampling for Ollama.                                                 |
+| [Postman][postman]                          |✅           | ✅        | ✅      | ❌         | ❌    | Supports tools, resources, and prompts                                                 |
 | [Roo Code][Roo Code]                        | ✅          | ❌        | ✅      | ❌         | ❌    | Supports tools and resources.                                               |
 | [Sourcegraph Cody][Cody]                    | ✅          | ❌        | ❌      | ❌         | ❌    | Supports resources through OpenCTX                                          |
 | [SpinAI][SpinAI]                            | ❌          | ❌        | ✅      | ❌         | ❌    | Supports tools for Typescript AI Agents                                     |