Add LICENSE file and update README with installation and usage instructions

README.md

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+# UFF Search
+
+UFF Search is a desktop application for Windows that allows you to perform fast, fuzzy full-text searches on your local files.
+
+It builds a search index for the folders you specify, allowing you to quickly find documents even with typos in your search query.
+
+## Features
+
+*   **Local Full-Text Search:** Indexes and searches the content of files in your selected folders.
+*   **Fuzzy Search:** Finds relevant files even if your search term has typos, powered by `rapidfuzz`.
+*   **Wide File Type Support:** Extracts text from PDFs, and various plain text formats (`.txt`, `.md`, `.py`, `.json`, `.csv`, `.html`, `.log`, `.ini`, `.xml`).
+*   **Simple UI:** An easy-to-use interface to manage your indexed folders and view search results.
+*   **Click to Open:** Search results can be clicked to open the file directly.
+*   **Self-Contained:** Stores its index in your local application data folder.
+
+## Installation
+
+### Windows Installer
+A pre-built installer (`UFF_Search_Installer_v3.exe`) is available for easy installation.
+
+### From Source
+To run the application from the source code, you'll need Python and the following dependencies:
+
+1.  **Clone the repository:**
+    ```bash
+    git clone <repository-url>
+    cd unsorted-folder-full-text-search
+    ```
+
+2.  **Install dependencies:**
+    It is recommended to use a virtual environment.
+    ```bash
+    pip install -r requirements.txt
+    ```
+
+3.  **Run the application:**
+    ```bash
+    python uff_app.py
+    ```
+
+## Usage
+
+1.  Start the application.
+2.  Click **" + Hinzufügen"** (Add) to select a folder you want to index. The application will start scanning it immediately.
+3.  Once indexing is complete, type your search query into the search bar and press Enter or click **"Suchen"** (Search).
+4.  Results will appear below. Click on any result to open the file.
+5.  To re-scan a folder for changes, select it from the list and click **"↻ Neu scannen"** (Rescan).
+6.  To remove a folder, select it and click **" - Entfernen"** (Remove).
+
+## License
+
+This project is licensed under the GNU Affero General Public License v3.0. See the [LICENSE](LICENSE) file for details.