Update README

README.md

@@ -1 +1,33 @@
-# gpt-html
+<div align="center">
+  <h1>
+    gpt-http
+  </h1>
+  <p>
+    <strong>
+     GPT website generator
+    </strong>
+  </p>
+</div>
+
+## About
+
+A website where the HTML content for any given request path is generated by GPT using the [OpenAI API](https://platform.openai.com/). Inspired by [LiveOverflow's video](https://www.youtube.com/watch?v=M2uH6HnodlM) building something similar.
+
+The application is deployed at [gpt.dtcristo.com](https://gpt.dtcristo.com/) but it is protected by HTTP Basic authentication. Please contact me directly if you want the credentials to try it out. Otherwise, get your own OpenAI API key from [platform.openai.com](https://platform.openai.com/) and run it yourself.
+
+## Usage
+
+Requires a Ruby environment, tested with Ruby 3.2.
+
+```sh
+# Set OpenAI API key as environment variable.
+export OPENAI_API_KEY="your_api_key_here"
+
+# Install dependencies.
+bundle install
+
+# Start the web server.
+bundle exec puma
+```
+
+Application live at [localhost:9292](http://localhost:9292/).