initial commit

.gitignore

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+/.phpunit.cache
+/.php-cs-fixer.cache
+/.php-cs-fixer.php
+/composer.lock
+/vendor/
+.idea

CONTRIBUTING.md

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+# CONTRIBUTING
+
+Contributions are welcome, and are accepted via pull requests.
+Please review these guidelines before submitting any pull requests.
+
+## Process
+
+1. Fork the project
+1. Create a new branch
+1. Code, test, commit and push
+1. Open a pull request detailing your changes. Make sure to follow the [template](.github/PULL_REQUEST_TEMPLATE.md)
+
+## Guidelines
+
+* Please ensure the coding style running `composer lint`.
+* Send a coherent commit history, making sure each individual commit in your pull request is meaningful.
+* You may need to [rebase](https://git-scm.com/book/en/v2/Git-Branching-Rebasing) to avoid merge conflicts.
+* Please remember that we follow [SemVer](http://semver.org/).
+
+## Setup
+
+Clone your fork, then install the dev dependencies:
+```bash
+composer install
+```
+
+## Lint
+
+Lint your code:
+```bash
+composer lint
+```
+
+## Tests
+
+Run all tests:
+```bash
+composer test
+```
+
+Check types:
+```bash
+composer test:types
+```
+
+Unit tests:
+```bash
+composer test:unit
+```

LICENSE

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+IT License
+
+Copyright (c) 2023 Google Gemini PHP
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.