Docs: READMEs for component framework integrations (#2880)

* docs: add base integration readme temp for Vue

* docs: copy integration temp across renderers

* feat: add get started with components section

* feat: adapt comp integration docs for lit

* nit: THERES TWO WAYS SPECIFICALLY

* nit: there's more edits wait "there are" dangit

1 files changed, 65 insertions, 0 deletions

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+# @astrojs/react ⚛️
+
+This **[Astro integration][astro-integration]** enables server-side rendering and client-side hydration for your [React](https://reactjs.org/) components.
+
+## Installation
+
+There are two ways to add integrations to your project. Let's try the most convenient option first!
+
+### (experimental) `astro add` command
+
+Astro includes a CLI tool for adding first party integrations: `astro add`. This command will:
+1. (Optionally) Install all necessary dependencies and peer dependencies
+2. (Also optionally) Update your `astro.config.*` file to apply this integration
+
+To install `@astrojs/react`, run the following from your project directory and follow the prompts:
+
+```sh
+# Using NPM
+npx astro add react
+# Using Yarn
+yarn astro add react
+# Using PNPM
+pnpx astro add react
+```
+
+If you run into any hiccups, [feel free to log an issue on our GitHub](https://github.com/withastro/astro/issues) and try the manual installation steps below.
+
+### Install dependencies manually
+
+First, install the `@astrojs/react` integration like so:
+
+```
+npm install @astrojs/react
+```
+
+Most package managers will install associated peer dependencies as well. Still, if you see a "Cannot find package 'react'" (or similar) warning when you start up Astro, you'll need to install `react` and `react-dom`:
+
+```sh
+npm install react react-dom
+```
+
+Now, apply this integration to your `astro.config.*` file using the `integrations` property:
+
+__astro.config.mjs__
+
+```js
+import react from '@astrojs/react';
+
+export default {
+  // ...
+  integrations: [react()],
+}
+```
+
+## Getting started
+
+To use your first React component in Astro, head to our [UI framework documentation][astro-ui-frameworks]. You'll explore:
+- 📦 how framework components are loaded,
+- 💧 client-side hydration options, and
+- 🪆 opportunities to mix and nest frameworks together
+
+Also check our [Astro Integration Documentation][astro-integration] for more on integrations.
+
+[astro-integration]: https://docs.astro.build/en/guides/integrations-guide/
+[astro-ui-frameworks]: https://docs.astro.build/en/core-concepts/framework-components/#using-framework-components
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