chore: improve clarity of prompt in the init command

[mdafanasev]

Pull Request Checklist

• Prompt text of the init command has been updated

Describe what you have changed in this PR.

I have updated the prompt text for the init command to avoid confusion between asking about library creation and asking additional questions.

Closes #1824

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (7ca0d91) 85.24% compared to head (30ec616) 85.24%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1825   +/-   ##
=======================================
  Coverage   85.24%   85.24%           
=======================================
  Files          99       99           
  Lines        9028     9028           
  Branches     1953     1953           
=======================================
  Hits         7696     7696           
  Misses        902      902           
  Partials      430      430           

Flag	Coverage Δ
unittests	85.05% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pdm/cli/commands/init.py	94.52% <ø> (ø)

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[frostming]

Thanks