Add user credentials

README.md

@@ -15,4 +15,7 @@ On this organization page, you'll find cool datasets and Spaces to play with Arg
 
 The best place to start is the `Demo` Space below 👇 It contains several sample datasets for exploration and labeling.
 
+You might need to login first into the Argilla so for that you use the following credentials to browse through the datasets.
 
+- username: `argilla`
+- password: `1234`