add id for adduser

typescript/Frontend/src/components/Users/AddUser.tsx

@@ -22,8 +22,12 @@ const AddUser = () => {
 
   return (
     <>
-      <InnovenergyButton sx={{ my: 1 }} onClick={() => setOpen(true)}>
-        <FormattedMessage id="addNewChild" defaultMessage="Add user" />
+      <InnovenergyButton
+        id="add-user-button"
+        sx={{ my: 1 }}
+        onClick={() => setOpen(true)}
+      >
+        <FormattedMessage id="addUser" defaultMessage="Add user" />
       </InnovenergyButton>
       <Dialog
         onClose={() => setOpen(false)}