Add UTAU.gitignore

[oxygen-dioxide]

Reasons for making this change

UTAU is a singing voice synthesizer. A UTAU voicebank containes audio files (.wav)、voicebank configurations (oto.ini, presamp.ini, character.txt, prefix.map, etc.). When developing UTAU voicebanks on Github, compiled data files (llsm, frq, mrq, etc.) will be generated. We don't want these compiled data files to be uploaded to Github, because they are large and they can be regenerated using the wav files.

Links to documentation supporting these rule changes

This .gitignore file includes file formats generated and used by various community tools, so there isn't a simple documentation that covers them all.

format	tool
.ctspec, .dio, .d4c	NeoWorld
.frc	model4
.frq, .uspec, $read	UTAU
.lessaudio	Lessampler
.llsm, .mrq	moresampler
.pmk, .star, .platinum	TIPS
.vs4ufrq	VocalShifter
.sc.npz	Straycat
*.setParam-Scache, *.lbp, *.lbp.caches/*	vlabeler
.errors.txt	OpenUtau
*.DVModel, *-log.txt, SKC, SKI, SKC_1, SKC_2, *.sksd	Deepvocal
.pkf	Adobe Audition

https://gitee.com/functioner/qfrqeditor describes some of these formats.

An example repo: https://github.com/oxygen-dioxide/hitsuboku-kumi-chn/blob/main/.gitignore

If this is a new template

Link to application or project’s homepage: https://utau2008.xrea.jp/

Merge and Approval Steps

• Confirm that you've read the contribution guidelines and ensured your PR aligns
• Ensure CI is passing
• Get a review and Approval from one of the maintainers

[dooleydevin]

This looks great! I'm not familiar with UTAU, but from the documentation you linked most of this looks good to me. Since the template is in the community directory, I'm comfortable with what we have here under the assumption that others can contribute should anything be unreasonable.

Just a couple small changes I'd like to see before this is ready to merge 😄

[dooleydevin]

Thank you for the contribution!