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README.md

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+
+# Open Port Killer
+
+A cross-platform GUI utility to find and kill processes with open network ports. Built with Python, tkinter, and psutil.
+
+## Features
+
+- **Cross-Platform:** Works on Windows, Linux, and macOS.
+- **Process Listing:** Scans and lists all local processes with open TCP ports.
+- **Kill Processes:** Easily terminate one or more selected processes from the GUI.
+- **Sortable List:** Click any column header to sort the process list.
+- **Multi-Language:** Switch between English and German on-the-fly.
+
+## Installation & Usage
+
+1.  **Prerequisites:**
+    - Python 3.6+ must be installed.
+
+2.  **Clone the repository (or download the source):
+    ```sh
+    git clone <repository_url>
+    cd OpenPortKiller
+    ```
+
+3.  **Install dependencies:**
+    ```sh
+    pip install -r requirements.txt
+    ```
+
+4.  **Run the application:**
+    ```sh
+    python main.py
+    ```
+
+## Building from Source
+
+You can create a standalone executable for your operating system using the provided build scripts. This requires `pyinstaller`, which is included in `requirements.txt`.
+
+The executable will be placed in the `dist` directory.
+
+### Windows
+
+Run the batch file:
+```cmd
+.\build.bat
+```
+
+### Linux / macOS
+
+First, make the script executable, then run it:
+```sh
+chmod +x build.sh
+./build.sh
+```
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE.md](LICENSE.md) file for details.