Lets add an example with PreJSS

As this api adds styled primitives similar to styled-components, people often expect it to work with template string literals as well, we should add an example how to use them all together.

No file or test is named. Start by inspecting the repository's existing examples and the styled-jss API entry points, then determine where examples are kept and how template string literals are currently demonstrated. Done means a clear example showing the styled primitives, PreJSS, and template string literals working together.

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