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

open-webui/README.md

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+# Open WebUI
+
+Open WebUI is a comprehensive, open-source web interface for AI models. It features a user-friendly design similar to ChatGPT and can connect to local or hosted LLM backends.
+
+## Dependencies
+
+None required, but works best with a local LLM backend like **vLLM** deployed on your cluster.
+
+## Configuration
+
+Key settings configured through your instance's `config.yaml`:
+
+- **domain** - Where the UI will be accessible (default: `chat.{your-cloud-domain}`)
+- **vllmApiUrl** - URL of your LLM backend (default: connects to vLLM on the cluster)
+- **enableSignup** - Whether to allow new account creation (default: `false`)
+- **storage** - Persistent volume size (default: `10Gi`)
+
+## Access
+
+After deployment, Open WebUI will be available at:
+- `https://chat.{your-cloud-domain}`
+
+## First-Time Setup
+
+1. Deploy a local LLM backend (e.g., vLLM) if you haven't already
+
+2. Add and deploy the app:
+   ```bash
+   wild app add open-webui
+   wild app deploy open-webui
+   ```
+
+3. Create your account and start chatting with your local AI models