Update README.md

Author: damalis

README.md

@@ -224,6 +224,10 @@ docker container restart slim
 add and/or remove slim site folders and files with any ftp client program in ```./slim/webapp``` folder.
 <br />You can also visit `https://example.com` to access website after starting the containers.
 
+### Database
+
+Database server name = database
+
 #### HTTP Caching
 
 [HTTP Cache](https://www.slimframework.com/docs/v3/features/caching.html); Slim 4 uses the optional standalone slimphp/Slim-HttpCache PHP component for HTTP caching.