Add README, LICENSE, and CONTRIBUTING (#13088)

* Add README, LICENSE, CONTRIBUTING, and CODE_OF_CONDUCT

* Add alpha status to README.

* Remove intro sentence

---------

Co-authored-by: Adam Wathan <[email protected]>

Author: KrisBraun

.github/CONTRIBUTING.md

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+# Contributing
+
+## Bug fixes
+
+If you've found a bug in Tailwind that you'd like to fix, [submit a pull request](https://github.com/tailwindlabs/tailwindcss/pulls) with your changes. Include a helpful description of the problem and how your changes address it, and provide tests so we can verify the fix works as expected.
+
+## New features
+
+If there's a new feature you'd like to see added to Tailwind, [share your idea with us](https://github.com/tailwindlabs/tailwindcss/discussions/new?category=ideas) in our discussion forum to get it on our radar as something to consider for a future release.
+
+**Please note that we don't often accept pull requests for new features.** Adding a new feature to Tailwind requires us to think through the entire problem ourselves to make sure we agree with the proposed API, which means the feature needs to be high on our own priority list for us to be able to give it the attention it needs.
+
+If you open a pull request for a new feature, we're likely to close it not because it's a bad idea, but because we aren't ready to prioritize the feature and we don't want to the PR to sit open for months or even years.
+
+## Coding standards
+
+Our code formatting rules are defined in the `"prettier"` section of [package.json](https://github.com/tailwindcss/tailwindcss/blob/next/package.json). You can check your code against these standards by running:
+
+```sh
+pnpm run lint
+```
+
+To automatically fix any style violations in your code, you can run:
+
+```sh
+pnpm run format
+```
+
+## Running tests
+
+You can run the test suite using the following commands:
+
+```sh
+pnpm build && pnpm test
+```
+
+Please ensure that the tests are passing when submitting a pull request. If you're adding new features to Tailwind, please include tests.

LICENSE

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+MIT License
+
+Copyright (c) Tailwind Labs, Inc.
+
+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.

README.md

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+<p align="center">
+  <a href="https://tailwindcss.com" target="_blank">
+    <picture>
+      <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-dark.svg">
+      <source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-light.svg">
+      <img alt="Tailwind CSS" src="https://raw.githubusercontent.com/tailwindlabs/tailwindcss/HEAD/.github/logo-light.svg" width="350" height="70" style="max-width: 100%;">
+    </picture>
+  </a>
+</p>
+
+<p align="center">
+  A utility-first CSS framework for rapidly building custom user interfaces.
+</p>
+
+<p align="center">
+    <a href="https://github.com/tailwindlabs/tailwindcss/actions"><img src="https://img.shields.io/github/actions/workflow/status/tailwindlabs/tailwindcss/ci-stable.yml?branch=next" alt="Build Status"></a>
+    <a href="https://www.npmjs.com/package/tailwindcss"><img src="https://img.shields.io/npm/dt/tailwindcss.svg" alt="Total Downloads"></a>
+    <a href="https://github.com/tailwindcss/tailwindcss/releases"><img src="https://img.shields.io/npm/v/tailwindcss.svg" alt="Latest Release"></a>
+    <a href="https://github.com/tailwindcss/tailwindcss/blob/master/LICENSE"><img src="https://img.shields.io/npm/l/tailwindcss.svg" alt="License"></a>
+</p>
+
+---
+
+## Documentation
+
+For full documentation, visit [tailwindcss.com](https://tailwindcss.com).
+
+## Community
+
+For help, discussion about best practices, or any other conversation that would benefit from being searchable:
+
+[Discuss Tailwind CSS on GitHub](https://github.com/tailwindcss/tailwindcss/discussions)
+
+For chatting with others using the framework:
+
+[Join the Tailwind CSS Discord Server](https://discord.gg/7NF8GNe)
+
+## Contributing
+
+If you're interested in contributing to Tailwind CSS, please read our [contributing docs](https://github.com/tailwindcss/tailwindcss/blob/next/.github/CONTRIBUTING.md) **before submitting a pull request**.