Add README.md with project overview and architecture

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README.md

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+# Web Development Playground
+
+This project has two main goals:
+
+1. **Learn web development basics** - Practice HTML, CSS, and vanilla JavaScript with a simple backend that has low dependencies and is easy to run
+2. **Build minimal examples** - Create the basic features needed for a hobby browser game project
+
+## Architecture
+
+This repository contains the HTML/CSS/JavaScript frontend and Go backend code. The full setup relies on external components not included in this repo:
+
+- **Caddy webserver** - Serves the HTML/CSS/JS files directly and handles authentication
+- **Authelia** - Provides user authentication and session management
+- **Reverse proxy** - API requests are forwarded from Caddy to the running Go executable
+
+## Learning Focus
+
+This is a learning project that prioritizes **readability and simplicity** over "best practices" or complex patterns. No massive dependencies or frameworks will be introduced - keeping everything straightforward and easy to understand.
+
+The project includes cheat sheets explaining common patterns used:
+- Go patterns commonly found in this codebase (for those less familiar with Go)
+- JavaScript patterns may be added if needed