DOC: small user manual

docs/usage/lumos.md

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+# Lumos: System Search
+
+**Lumos** is the powerful, system-wide search and launch assistant for BoredOS. It allows you to find applications, documents, and system files instantly without navigating through folders.
+
+## Opening Lumos
+
+To activate Lumos at any time, use the global keyboard shortcut:
+
+**`Shift + Ctrl + Space`**
+
+The Lumos search modal will appear in the center of your screen, ready for input.
+
+## Features
+
+-   **Fuzzy Searching**: You don't need to type the exact name. Lumos uses fuzzy matching to find the most relevant results as you type.
+-   **Deep Indexing**: Lumos indexes files across the entire system.
+-   **Quick Launch**: Once you find what you're looking for, launching it is as simple as pressing `Enter`.
+
+## Navigation
+
+When the Lumos window is open:
+-   **Type**: Just start typing to filter results.
+-   **Arrow Keys (Up/Down)**: Move the selection highlight through the list of results.
+-   **Enter**: Launch the selected file or application.
+-   **Backspace**: Delete characters in your search query.
+-   **Escape**: Close Lumos and return to the desktop.
+
+---
+[Return to Documentation Index](../README.md)