chore(example): add example in progress (#271)

Signed-off-by: jokemanfire <hu.dingyang@zte.com.cn>

examples/clients/README.md

@@ -4,6 +4,7 @@ This directory contains Model Context Protocol (MCP) client examples implemented
 
 ## Example List
 
+
 ### SSE Client (`sse.rs`)
 
 A client that communicates with an MCP server using Server-Sent Events (SSE) transport.
@@ -67,6 +68,16 @@ A client demonstrating how to use the sampling tool.
 - Retrieves server information and list of available tools
 - Calls the `ask_llm` tool
 
+### Progress Test Client (`progress_test_client.rs`)
+
+A client that communicates with an MCP server using progress notifications.
+
+- Launches the `cargo run --example clients_progress_client -- --transport {stdio|sse|http|all}` to test the progress notifications
+- Connects to the server using different transport methods
+- Tests the progress notifications
+- The sse and http should run the server first
+
+
 ## How to Run
 
 Each example can be run using Cargo: