add(readme): upload_folder_path element

Author: hahuyhoang411

README.md

@@ -128,11 +128,12 @@ Table of parameters
 
 ***OPTIONAL***: You can run Nitro on a different port like 5000 instead of 3928 by running it manually in terminal
 ```zsh
-./nitro 1 127.0.0.1 5000 ([thread_num] [host] [port])
+./nitro 1 127.0.0.1 5000 ([thread_num] [host] [port] [uploads_folder_path])
 ```
 - thread_num : the number of thread that nitro webserver needs to have
 - host : host value normally 127.0.0.1 or 0.0.0.0
 - port : the port that nitro got deployed onto
+- uploads_folder_path: custom path for file uploads in Drogon.
 
 Nitro server is compatible with the OpenAI format, so you can expect the same output as the OpenAI ChatGPT API.