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Andy Wolff 56bf76f2f0 Add copyright to source files in simple_shader and simple_sdf (#2837 ) @gaaclarke noticed the copyright was missing from the top of these files, so this PR adds them. ## Pre-launch Checklist - [x] I read the [Flutter Style Guide] _recently_, and have followed its advice. - [x] I signed the [CLA]. - [x] I read the [Contributors Guide]. - [ ] I have added sample code updates to the [changelog]. - [x] I updated/added relevant documentation (doc comments with `///`). If you need help, consider asking for advice on the #hackers-devrel channel on [Discord]. <!-- Links --> [Flutter Style Guide]: https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md [CLA]: https://cla.developers.google.com/ [Discord]: https://github.com/flutter/flutter/blob/master/docs/contributing/Chat.md [Contributors Guide]: https://github.com/flutter/samples/blob/main/CONTRIBUTING.md [changelog]: ../CHANGELOG.md		2 weeks ago
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lib	Add copyright to source files in simple_shader and simple_sdf (#2837 )	2 weeks ago
shaders	Add copyright to source files in simple_shader and simple_sdf (#2837 )	2 weeks ago
test	Add copyright to source files in simple_shader and simple_sdf (#2837 )	2 weeks ago
.gitignore	Add new sample simple_sdf (#2835 )	2 weeks ago
README.md	Add new sample simple_sdf (#2835 )	2 weeks ago
analysis_options.yaml	Add new sample simple_sdf (#2835 )	2 weeks ago
pubspec.yaml	Add new sample simple_sdf (#2835 )	2 weeks ago
screenshot.png	Add new sample simple_sdf (#2835 )	2 weeks ago

README.md

`simple_sdf`

A simple Flutter fragment shaders sample project showing how to draw Signed Distance Functions with the FragmentShader API.

Use flutter create --no-overwrite . to initialize the project.