feat: improve client instantiation examples

[erdemtuna]

Resolves #435.

• I restructured the document so that client instantiation is placed at the top. In the old version, the section was at the very bottom, which was inconvenient for a new reader.
• I also improved the URL build options text by looking at rueidis/url.go

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.49%. Comparing base (d83782c) to head (c021254).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #492      +/-   ##
==========================================
- Coverage   95.50%   95.49%   -0.01%     
==========================================
  Files          78       78              
  Lines       32941    32941              
==========================================
- Hits        31460    31457       -3     
- Misses       1275     1277       +2     
- Partials      206      207       +1     

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[rueian]

Hi @erdemtuna, thank you very much. The content of these two sections looks good to me.

However, I put them at the bottom of the README intentionally because I like to prioritize the command builder and the auto pipelining. I believe the getting started section is already sufficient for new readers and they can find more details later at the bottom.

If we really need to put these initialization sections to the top, I think we had better further shorten their paragraph and merge them into the getting started section, or we can just leave them at the bottom.

[erdemtuna]

Hi @rueian, thank you for the feedback. I will try to come up with another alternative based on your concerns.

[erdemtuna]

@rueian what do you think about the new version?

[rueian]

Thanks! That looks good!