agui 0.3.0

A reactive GUI project
Documentation
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## Pull request type


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Please check the type of change your PR introduces:

- [ ] Bugfix
- [ ] Feature
- [ ] Code style update (formatting, renaming)
- [ ] Refactoring (no functional changes, no api changes)
- [ ] Build related changes
- [ ] Documentation content changes
- [ ] Other (please describe):

## What is the current behavior?


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Issue Number: N/A

## What is the new behavior?


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## Other information


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