Update README to add access information when user tried to run elsa w…

…ith docker (elsa-workflows#4708)

README.md

@@ -29,8 +29,16 @@ To give the Elsa Studio + Elsa Server a quick spin, you can run the following co
 docker pull elsaworkflows/elsa-v3:latest
 docker run -t -i -e ASPNETCORE_ENVIRONMENT='Development' -e HTTP_PORTS=8080 -p 13000:8080 elsaworkflows/elsa-v3:latest
 ```
+
 > This Docker image is based on a reference ASP.NET application that hosts both the workflow server and designer and is not intended for production use.
 
+By default, you can access http:https://localhost:13000 and log in with:
+
+```
+ Username: admin
+ Password: password
+```
+
 ## Table of Contents
 
 - [Documentation](#documentation)