Update README with project description and Playground link (#7)

* Update README with project description and Playground link

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix Playground link to use git:directory blueprint

The simple ?plugin= parameter doesn't support GitHub repo URLs.
Use an inline blueprint with git:directory resource instead.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix Playground link to use base64-encoded blueprint

Percent-encoded JSON caused 'Invalid blueprint' errors. Base64
encoding is the recommended format for blueprint URLs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Commit build assets for Playground and direct GitHub installs

Remove build/ from .gitignore and commit compiled JS/CSS so the
plugin works when loaded directly from the repository.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: dd32

.gitignore

@@ -1,6 +1,5 @@
 node_modules/
 vendor/
-build/
 *.log
 package-lock.json
 composer.lock

README.md

@@ -1,2 +1,38 @@
-# multi-author-posts
-A WordPress plugin to allow multi-author posts
+# Multi-Author Posts
+
+A WordPress plugin that allows multiple authors to edit a single post via shared invite links. Compatible with WordPress collaborative editing.
+
+[Test in WordPress Playground](https://playground.wordpress.net/#eyJsYW5kaW5nUGFnZSI6Ii93cC1hZG1pbi9wb3N0LW5ldy5waHAiLCJsb2dpbiI6dHJ1ZSwic3RlcHMiOlt7InN0ZXAiOiJpbnN0YWxsUGx1Z2luIiwicGx1Z2luRGF0YSI6eyJyZXNvdXJjZSI6ImdpdDpkaXJlY3RvcnkiLCJ1cmwiOiJodHRwczovL2dpdGh1Yi5jb20vZGQzMi9tdWx0aS1hdXRob3ItcG9zdHMiLCJyZWYiOiJIRUFEIiwicmVmVHlwZSI6InJlZm5hbWUifX1dfQ==)
+
+## Features
+
+- **Co-author management** -- Add or remove co-authors from any post via the block editor sidebar panel.
+- **Shared invite links** -- Generate a shareable URL that lets any registered user join as a co-author.
+- **Capability-aware** -- Co-authors can edit and read their assigned posts without gaining broader site permissions.
+- **Multisite support** -- Invited users are automatically added to the site with a subscriber role so they can access the editor.
+- **Author preservation** -- When a post's author is reassigned, the previous author is automatically kept as a co-author.
+
+## Requirements
+
+- WordPress 6.6+
+- PHP 7.4+
+- Node.js 20+ (for development)
+
+## Development
+
+```bash
+# Install dependencies
+npm install
+
+# Start the development environment
+npm run env:start
+
+# Build the editor assets
+npm run build
+
+# Run JavaScript tests
+npm run test:unit
+
+# Run PHP tests (requires wp-env)
+npm run test:php
+```

build/index-rtl.css

@@ -0,0 +1 @@
+<?php return array('dependencies' => array('react-jsx-runtime', 'wp-api-fetch', 'wp-components', 'wp-core-data', 'wp-data', 'wp-editor', 'wp-element', 'wp-i18n', 'wp-plugins'), 'version' => 'e44cf7ba85b1a87d62e8');