Adjust parameters in .env.example for docker setup

Author: thecodeholic

.env.example

@@ -1,3 +1,3 @@
-DB_DSN = mysql:host=localhost;port=3306;dbname=mvc_framework
-DB_USER = root
-DB_PASSWORD =
+DB_DSN = mysql:host=db;port=3306;dbname=php_mvc
+DB_USER = php_mvc
+DB_PASSWORD = php_mvc