Improved README

Author: mpyw

README.md

@@ -4,12 +4,16 @@ Reverse proxy for PHP built-in server which supports multiprocessing and TLS/SSL
 
 ## Installing
 
+For development environment...
+
 ```
 composer require --dev mpyw/php-hyper-builtin-server:^1.0
 ```
 
 ## Usage
 
+Start listening on `http://localhost:8080` and `https://localhost:8081`.
+
 ```
 vendor/bin/hyper-run <DocumentRoot>
 ```