Adds etherpad app.

etherpad/versions/2/README.md

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+# Etherpad
+
+Etherpad is a real-time collaborative document editor. Multiple users can write and edit documents simultaneously.
+
+## Dependencies
+
+- **PostgreSQL** - Database for storing pads and history
+
+## Configuration
+
+Key settings in `config.yaml`:
+
+- **domain** - Where Etherpad will be accessible
+- **storage** - Persistent volume size (default: `2Gi`)
+- **title** - Instance name shown in the browser (default: `Etherpad`)
+
+## Usage
+
+No account is required to create or edit pads. Just visit the app URL and:
+
+- Click **New Pad** to create a document
+- Share the pad URL with collaborators — anyone with the link can edit in real time
+
+## Admin Panel
+
+An admin panel is available at `/admin`:
+- **Username**: `admin`
+- **Password**: value of `adminPassword` in your `secrets.yaml`
+
+Use the admin panel to manage plugins, view connected users, and configure the instance.
+
+## Notes
+
+- Pads are identified by URL — anyone with the link can view and edit by default
+- Password-protected pads can be created via the admin panel settings
+- The admin panel also provides access to the plugin manager for extending functionality