Add wait_for_completion tool to readme.md

Author: yotsuda

README.md

@@ -14,11 +14,11 @@ Malicious use could result in severe damage. Use responsibly and only in trusted
 
 PowerShell.MCP is a tool that enables AI assistants (such as Claude Desktop) to execute any PowerShell commands and CLI tools within a PowerShell console. Users can also execute cmdlets/.ps1/.bat/CLI tools in the same console, allowing AI and users to work collaboratively. It operates at high speed without needing to launch a new console each time, while preserving the state of imported modules, functions and variables.
 
-Despite its powerful capabilities, PowerShell.MCP is built with just three carefully designed tools:
+Despite its powerful capabilities, PowerShell.MCP is built with just four carefully designed tools:
 - **start_powershell_console:** launching a persistent console
 - **get_current_location:** retrieving the current working directory
 - **invoke_expression:** executing any cmdlets/.ps1/.bat/CLI tools (chainable with pipes) in the PS console
-
+- **wait_for_completion:** waiting for busy console(s) to complete and retrieving cached results
 This minimalist architecture provides maximum flexibility while maintaining simplicity.
 
 ### What Makes It Powerful