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

mysql/README.md

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+# MySQL
+
+MySQL is an open-source relational database management system. This deploys a shared MySQL instance used by apps that require MySQL (such as Ghost).
+
+## Dependencies
+
+None. MySQL is a standalone infrastructure service.
+
+## Configuration
+
+Key settings configured through your instance's `config.yaml`:
+
+- **storage** - Persistent volume size (default: `20Gi`)
+- **port** - Service port (default: `3306`)
+- **timezone** - Server timezone (default: `UTC`)
+
+## Usage
+
+Apps that depend on MySQL will connect to it at `mysql.mysql.svc.cluster.local:3306`. Database credentials are managed automatically through the secrets system.