add phpMyAdmin document.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

README.md

@@ -52,6 +52,8 @@ It's like Laravel Homestead but for Docker instead of Vagrant.
 		    - [Start/Stop xDebug](#Controll-xDebug)
 	- [Production](#Production)
 		- [Setup Laravel and Docker on Digital Ocean](#Digital-Ocean)
+	- [Database](#Database)
+		- [Use phpMyAdmin](#Use-phpMyAdmin)
 	- [Misc](#Misc)
 		- [Use custom Domain](#Use-custom-Domain)
 		- [Enable Global Composer Build Install](#Enable-Global-Composer-Build-Install)
@@ -868,10 +870,23 @@ To controll the behavior of xDebug (in the `php-fpm` Container), you can run the
 
 
 
+<br>
+<a name="Database"></a>
 
+<br>
+<a name="Use-phpMyAdmin"></a>
+### Use phpMyAdmin
 
+1 - First make sure you run the phpMyAdmin Container (`phpmyadmin`) with the `docker-compose up` command.
 
+```bash
+# use mysql
+docker-compose up -d mysql phpmyadmin
+# use mariadb
+docker-compose up -d mariadb phpmyadmin
+```
 
+2 - Open your browser and visit the localhost: `http://localhost:8080`