Update demo instructions

Author: pspanja

README.md

@@ -4,6 +4,7 @@
 
 ## How to run a demo
 
-1. Install dependencies using composer
-2. From the repo's root directory execute `php -S localhost:8005 -t examples/demo`
-3. Open http://localhost:8005 in your browser
+1. Clone the repository
+2. Generate autoloader using composer `composer dump-autoload -o`
+3. Start the web server with demo document root `php -S localhost:8005 -t examples/demo`
+4. Open http://localhost:8005 in your browser