🦇 Add dark mode to `README.md` (#703)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

README.md

@@ -3,6 +3,10 @@
 <a href="https://github.com/tiangolo/full-stack-fastapi-template/actions?query=workflow%3ATest" target="_blank"><img src="https://github.com/tiangolo/full-stack-fastapi-template/workflows/Test/badge.svg" alt="Test"></a>
 <a href="https://coverage-badge.samuelcolvin.workers.dev/redirect/tiangolo/full-stack-fastapi-template" target="_blank"><img src="https://coverage-badge.samuelcolvin.workers.dev/tiangolo/full-stack-fastapi-template.svg" alt="Coverage"></a>
 
+### Dashboard - Dark Mode
+
+[![API docs](img/dashboard-dark.png)](https://github.com/tiangolo/full-stack-fastapi-postgresql)
+
 ## Technology Stack and Features
 
 - ⚡ [**FastAPI**](https://fastapi.tiangolo.com) for the Python backend API.
@@ -13,6 +17,7 @@
     - 💃 Using TypeScript, hooks, Vite, and other parts of a modern frontend stack.
     - 🎨 [Chakra UI](https://chakra-ui.com) for the frontend components.
     - 🤖 An automatically generated frontend client.
+    - 🦇 Dark mode support.
 - 🐋 [Docker Compose](https://www.docker.com) for development and production.
 - 🔒 Secure password hashing by default.
 - 🔑 JWT token authentication.