feat: add llms.txt for improved LLM accessibility

README.md

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+# Markus Graf - Personal Website
+
+This is the source code for the personal website of Markus Graf, built with Hugo.
+
+## LLM Friendliness
+
+This website includes an `llms.txt` file in the root directory (served from `static/llms.txt`) to help Large Language Models (LLMs) discover and understand the content of the site. This file follows the [llms.txt specification](https://llmstxt.org/).
+
+When adding new content, please ensure that:
+1.  Important pages are listed in `static/llms.txt`.
+2.  Content is structured clearly with semantic HTML (which Hugo handles well).
+3.  Future improvements may include generating `.md` versions of pages for direct LLM consumption.
+
+## Development
+
+Run the local server:
+```bash
+hugo server -D
+```
+
+## Deployment
+
+See `DEPLOYMENT.md`.