Add WordPress Playground blueprint

docs/blueprint.json

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+{
+  "$schema": "https://playground.wordpress.net/blueprint-schema.json",
+  "phpExtensionBundles": [
+    "kitchen-sink"
+  ],
+  "features": {
+    "networking": true
+  },
+  "steps": [
+    {
+      "step": "installPlugin",
+      "pluginData": {
+        "resource": "url",
+        "url": "https://github-proxy.com/proxy/?repo=10up/distributor&branch=stable"
+      }
+    },
+    {
+      "step": "enableMultisite"
+    },
+    {
+      "step": "wp-cli",
+      "command": "wp plugin activate distributor-stable --network"
+    },
+    {
+      "step": "wp-cli",
+      "command": "wp site create --slug=test"
+    }
+  ]
+}

docs/demo-with-playground.md

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+Use WordPress Playground to quickly spin up a project to demonstrate the plugin's features.
+
+## Example
+
+This is an example URL you can use to run the project: `https://playground.wordpress.net/?blueprint-url=https://raw.githubusercontent.com/10up/distributor/refs/heads/develop/docs/blueprint.json`
+
+## Features
+
+The project has the following features:
+- it is a multisite installation
+- the Distributor plugin is installed and activated network-wide
+- the network contains two websites