AT-APPS-1205 describe flags (#188)

README.md

@@ -96,6 +96,15 @@ Flags:
   -v, --version         version for Use
 ```
 
+Set the configuration file path with `-c`.
+
+Without the `-r` flag, the file specified after `-c` is the actual configuration file.
+With the `-r` flag, the file specified after `-c` contains the path or URL to the actual configuration file. 
+
+For example, you may store your configurations remotely, such as on AWS S3 storage. 
+In this case, you could have a remote_config.yaml file containing S3 details, and you would run the server with `-c remote_config.yaml -r`.
+
+
 ### Run
 
 Run as a binary using a configuration file: