doc fix for running locally (#42)

* Update README.md

need to have Azure Function Core tools installed to run locally

* Update README.md

typo

README.md

@@ -69,7 +69,8 @@ You need to install following tools to work on your local machine:
 - [PowerShell 7+](https://github.com/powershell/powershell) _(for Windows users only)_
   - **Important**: Ensure you can run `pwsh.exe` from a PowerShell command. If this fails, you likely need to upgrade PowerShell.
   - Instead of Powershell, you can also use Git Bash or WSL to run the Azure Developer CLI commands.
-
+- [Azure Functions Core Tools](https://learn.microsoft.com/en-us/azure/azure-functions/functions-run-local?tabs=macos%2Cisolated-process%2Cnode-v4%2Cpython-v2%2Chttp-trigger%2Ccontainer-apps&pivots=programming-language-javascript)
+
 Then you can get the project code:
 
 1. [**Fork**](https://github.com/Azure-Samples/serverless-chat-langchainjs/fork) the project to create your own copy of this repository.