fix: auth robot test

back/test/robot/users/users.robot

@@ -0,0 +1,14 @@
+*** Settings ***
+Documentation       Tests of the /users route.
+...                 Ensures that the users CRUD works corectly.
+Resource            ../rest.resource
+
+
+*** Keywords ***
+*** Test Cases ***
+Create a user
+    [Documentation]    Create a user
+    POST    /users    {"username": "i-don-t-exist", "password": "pass", "email": "wow@gmail.com"}
+    Output
+    Integer    response status    201
+	[Teardown]    DELETE    /users/1