Add Apidog MCP Client to client list (modelcontextprotocol#2169)

* Document Apidog MCP Client with key features

Add detailed documentation for Apidog MCP Client, highlighting its features and capabilities.

* Update docs/clients.mdx

Co-authored-by: Jonathan Hefner <jonathan@hefner.pro>

---------

Co-authored-by: Den Delimarsky <53200638+localden@users.noreply.github.com>
Co-authored-by: Jonathan Hefner <jonathan@hefner.pro>

Author: 3 people

docs/clients.mdx

@@ -441,6 +441,24 @@ Amp is an agentic coding tool built by Sourcegraph. It runs in VS Code (and comp
 
 </McpClient>
 
+<McpClient
+  name="Apidog"
+  homepage="https://apidog.com"
+  supports="Resources, Prompts, Tools"
+  instructions="https://docs.apidog.com/mcp-client-1930835m0"
+>
+
+Apidog, an all-in-one API development and testing platform, features a built-in MCP Client designed for debugging and testing MCP Servers.
+
+**Key features:**
+
+- **Full Feature Support**: Debug Tools, Prompts, and Resources of MCP servers with a user-friendly GUI.
+- **Dual Transport Modes**: Supports both STDIO for local processes and HTTP for remote servers.
+- **Easy Setup**: Automatically parses MCP configuration files and supports direct command or URL input.
+- **Authentication**: Supports OAuth 2.0, API Key, Bearer Token, and other methods for secure connections.
+
+</McpClient>
+
 <McpClient
   name="Apify MCP Tester"
   homepage="https://github.com/apify/tester-mcp-client"