Add --rd option to velph-phono3py-init

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Codecov Report

Attention: Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.11%. Comparing base (449036b) to head (564f1b0).
Report is 3 commits behind head on develop.

Files	Patch %	Lines
src/phelel/velph/cli/phono3py/__init__.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop       #6      +/-   ##
===========================================
- Coverage    73.36%   73.11%   -0.26%     
===========================================
  Files           71       75       +4     
  Lines         5069     5203     +134     
===========================================
+ Hits          3719     3804      +85     
- Misses        1350     1399      +49     

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