Add USAGE.md explaining how to use the script

USAGE.md

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+# How to Use the Video Converter (Current State)
+
+This document outlines the steps required to set up and run the Video Converter script in its current development state.
+
+## 1. Prerequisites
+
+Before running the script, ensure you have the following installed on your **Arch Linux / CachyOS** system:
+
+*   **Python 3:** The script is written in Python 3.
+*   **`ffmpeg-full`:** A version of `ffmpeg` compiled with DNxHD/HR support.
+    *   Install from AUR: `yay -S ffmpeg-full` (or your preferred AUR helper).
+    *   **Note:** If you use OBS Studio, refer to the [README.md](README.md) for potential dependency workarounds.
+
+## 2. Setup
+
+1.  **Clone the Repository:**
+    ```bash
+    git clone https://gitea.ramforth.net/ramforth/video-converter.git
+    cd video-converter
+    ```
+
+2.  **Create and Activate a Python Virtual Environment:**
+    It's highly recommended to use a virtual environment to manage Python dependencies.
+    ```bash
+    python3 -m venv venv
+    source venv/bin/activate
+    ```
+
+3.  **Install Python Dependencies:**
+    ```bash
+    pip install -r requirements.txt
+    ```
+
+## 3. Running the Converter
+
+Once the setup is complete, you can run the converter script.
+
+### Basic Usage
+
+The script takes an input video file and an optional output directory.
+
+```bash
+python -m src.main <path_to_your_input_video_file> [-o <path_to_output_directory>]
+```
+
+*   Replace `<path_to_your_input_video_file>` with the absolute or relative path to the video file you want to convert.
+*   Replace `<path_to_output_directory>` with the desired directory for the converted file. If omitted, the converted file will be saved in the same directory as the input file.
+
+**Example:**
+
+```bash
+# Convert a video and save it in the same directory
+python -m src.main /home/user/Videos/my_original_video.mp4
+
+# Convert a video and save it to a specific output directory
+python -m src.main /home/user/Videos/my_original_video.mp4 -o /home/user/ConvertedVideos
+```
+
+### Output File Naming
+
+*   If an output directory is specified, the converted file will be named `my_original_video_DR_compatible.mov`.
+*   If no output directory is specified (i.e., the output is in the same directory as the input), the converted file will be named `recoded_my_original_video_DR_compatible.mov`.
+
+## 4. What it Does
+
+The script converts your input video into a DaVinci Resolve-compatible format using `ffmpeg`:
+
+*   **Video Codec:** `dnxhd` (DNxHD/HR)
+    *   **1080p (<=1080 height):** `dnxhr_sq` (Standard Quality)
+    *   **1440p (>1080 height):** `dnxhr_hq` (High Quality)
+*   **Audio Codec:** `pcm_s16le` (Linear PCM)
+*   **Container:** `.mov` (QuickTime)
+
+This ensures optimal compatibility and performance for editing in DaVinci Resolve (Free Linux version).
+
+---
+*Document generated by Gemini CLI Agent.*