Update README with clone and install instructions

Author: teetangh

README.md

@@ -31,6 +31,11 @@ We will walk through the different steps required to get the application running
 
 ```shell
 git clone https://github.com/couchbase-examples/php-laravel-quickstart.git
+```
+
+### Change Directory
+
+```shell
 cd php-laravel-quickstart
 ```