Keycloak REST API - create user

# Method: POST
# Headers
# Authorization Bearer eyJhbGciO... (access token)
# Content-Type: application/json

# Body
# {
# 	"username": "test-user",
# 	"groups": ["Comp1"], // doesn't work, even if it is in the docs
# 	"lastName": "test",
# 	"firstName": "joe",
# 	"email": "test@mail.de",
# 	"attributes": {"test": "attr"},
# 	"id": "c946d741-b2d6-44b6-9720-943614396faa", // doesn't work
# 	"enabled": true,
# 	"credentials":[{
# 		"type": "password",
# 		"value": "test",
# 		"temporary": false
# 	}],
# 	"realmRoles": "Tableau" // doesn't work
# }

http://127.0.0.1:8088/auth/admin/realms/app/users