[DOC] Quickstart suggestion -- add an example of tags

[mwcraig]

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Description

Based on a brief read of the rest of the documentation it looks like tags are an important concept/tool in astrodata. If it is straightforward to do, adding an example of tags in the quickstart would be great.

If it isn't feasible, then you could remove this import.

Solution

[If applicable, your solution to the issue]

Urgency

• This problem should be fixed quickly (urgent)
• This problem is minor/does not require immediate fixing.