Consider how to create variables in user keywords eg. VAR, @{var}, &{var}

Nobody has claimed this yet.

When creating keywords there are currently quite a lot of different ways to create variables.

In a variable section, to create a variable, a list, or a dictionary we use the following:

```
${var} Variable
@{list} 1 2 3 4
&{dict} key=value solution=user
```

In user keywords there are now (with equals, because why not..

```
${dct}= Create Dictionary vs &{dct}= Create Dictionary
${lst}= Create List vs @{lst}= Create List
${var}= Set Variable
```
But we also have syntax VAR. and that changes things as well:

```
VAR @{lst}
VAR ${scalar}
VAR &{dict}
```

Some guideline with this might be good.

Review the variable-section, user-keyword, and VAR syntax examples in the issue and compare the conventions they illustrate. Define what the style guide should recommend for scalar, list, and dictionary variables, then document the agreed guidance and examples; no file or test location is identified in the issue.

Written by the indexing model from the issue text.