docs: Add README.md for system_monitor_overlay

system_monitor_overlay/README.md

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+# System Monitor Overlay
+
+This overlay displays real-time system information like CPU and memory usage. It's designed to be used as a browser source in streaming software like OBS Studio.
+
+## Example Output
+
+*(Image to be provided by user)*
+
+## Installation
+
+To use this overlay, you need to run a small Python server on your computer to provide the system stats to the overlay.
+
+1.  **Install the required library:**
+
+    ```bash
+    pip install psutil
+    ```
+
+2.  **Run the server:**
+
+    ```bash
+    python server.py
+    ```
+
+    The server will start on port 8000.
+
+3.  **Add to OBS Studio:**
+
+    *   Add a new "Browser" source to your scene.
+    *   Set the URL to the `index.html` file in this directory.
+    *   Set the width and height to your desired dimensions.
+
+## Overlays
+
+*   `index.html`: The default overlay with a heading.
+*   `index-no-heading.html`: An alternative overlay without the heading.