Add README files for various applications: Decidim, Discourse, Example Admin, Example App, Ghost, Immich, Keila, Lemmy, Listmonk, Loomio, Matrix, Memcached, MySQL, Open WebUI, OpenProject, PostgreSQL, Redis, and vLLM

matrix/README.md

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+# Matrix (Synapse)
+
+Matrix is an open standard for secure, decentralized, real-time communication. This deploys the Synapse homeserver for self-hosted Matrix federation and messaging.
+
+## Dependencies
+
+- **PostgreSQL** - Database for storing messages and account data
+- **Redis** - Used for inter-worker communication
+
+## Configuration
+
+Key settings configured through your instance's `config.yaml`:
+
+- **domain** - Where the Synapse web client will be accessible (default: `matrix.{your-cloud-domain}`)
+- **serverName** - Your Matrix server identity, used in user IDs like `@user:{serverName}` (default: `{your-cloud-domain}`)
+- **enableRegistration** - Whether to allow public account creation (default: `false`)
+- **storage** - Persistent volume for Synapse data (default: `50Gi`)
+- **mediaStorage** - Persistent volume for uploaded media (default: `100Gi`)
+- **SMTP** - Email delivery settings inherited from your Wild Cloud instance
+
+## Access
+
+After deployment, the Synapse homeserver will be available at:
+- `https://matrix.{your-cloud-domain}`
+
+Connect using any Matrix client (Element, FluffyChat, etc.) with your server name.
+
+## First-Time Setup
+
+1. Add and deploy the app:
+   ```bash
+   wild app add matrix
+   wild app deploy matrix
+   ```
+
+2. Use the registration shared secret (in your `secrets.yaml`) to create your first admin account, or enable public registration temporarily
+
+3. Connect with a Matrix client and start messaging