Update readme for better SEO on DockerHub

Author: Mahmoudz

README.md

@@ -1,4 +1,8 @@
-#LaraDock PHP-FPM Base Image
+#Laradock's PHP-FPM Container Base Image
 
+Visit the [Laradock](https://github.com/Laradock/laradock) repository.
 
-Visit the [LaraDock](https://github.com/LaraDock/laradock) repository.
+## What is Laradock?
+Laradock is a Docker PHP development environment. It facilitate running PHP Apps on Docker.
+
+Laradock is configured to run Laravel Apps by default, and it can be modified to run all kinds of PHP Apps (Symfony, CodeIgniter, Wordpress, Drupal...).