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

example-app/README.md

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+# Example App
+
+An example application deployed with public access. This app is useful for testing Wild Cloud's public ingress, TLS, and external DNS configuration.
+
+The app uses the public wildcard TLS certificate and is accessible from the internet.
+
+## Access
+
+After deployment, the app will be available at:
+- `https://example-app.{your-cloud-domain}`