.DS_Store missing in .gitignore

[NatureIsFrequency]

Clap repositories on MacOS currently flag .DS_Store files as changes to the repository

Suggest following the convention of adding .DS_Store to .gitignore

As per the following repos: https://github.com/free-audio/clap-wrapper/blob/main/.gitignore https://github.com/free-audio/clap-helpers/blob/main/.gitignore https://github.com/free-audio/clap-juce-extensions/blob/main/.gitignore