Add frameworks/docs/react.md (#6233)

* Add frameworks/docs/react.md

* Suggested update.

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Co-authored-by: egilmorez <egilmore@google.com>

Author: chalosalvador

src/frameworks/docs/react.md

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+# Integrate React
+
+Using the Firebase CLI, you can deploy your React static web apps to Firebase 
+and serve them with Firebase Hosting.
+
+Note: Framework-aware Hosting is an early public preview. This means
+that the functionality might change in backward-incompatible ways. A preview
+release is not subject to any SLA or deprecation policy and may receive limited
+or no support.
+
+## Before you begin
+
+Before you get started deploying your app to Firebase,
+review the following requirements and options:
+
+- Firebase CLI version 12.1.0 or later. Make sure to
+  [install the CLI](/docs/cli#install_the_firebase_cli) using your preferred 
+	method.
+- Optional: An existing React project using Vite. You can create one with 
+	`npm create vite@latest -- --template react` or let the Firebase CLI
+	 [initialize a new project](#initialize-a-new-project) for you.
+
+
+## Initialize Firebase
+
+To get started, initialize Firebase for your framework project.
+Use the Firebase CLI for a new project, or modify `firebase.json` for an
+existing project.
+
+### Initialize a new project
+
+1. In the Firebase CLI, enable the web frameworks preview:
+   <pre class="devsite-terminal">firebase experiments:enable webframeworks</pre>
+1. Run the initialization command from the CLI and then follow the prompts:
+   <pre class="devsite-terminal">firebase init hosting</pre>
+1.  Answer yes to "Do you want to use a web framework? (experimental)"
+1.  Choose your hosting source directory.  If there is an existing React 
+    codebase (with Vite), the CLI detects it and the process completes.
+
+## Serve static content
+
+After initializing Firebase, you can serve static content with the standard
+deployment command:
+
+```shell
+firebase deploy
+```
+
+You can [view your deployed app](/docs/hosting/test-preview-deploy#view-changes)
+on its live site.