adding the CONTRIBUTING file (#260)

CONTRIBUTING.md

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+# Contributing to Ultimate Alarm Clock
+
+Thank you for considering contributing to the Ultimate Alarm Clock project! Your contributions are valuable and help make the application even better.
+
+
+
+## Prerequisites
+Before getting started, ensure you have the following prerequisites installed on your system:
+
+- [Flutter](https://flutter.dev/docs/get-started/install): Install the latest version of Flutter, including Dart SDK, by following the official installation guide.
+
+- [Git](https://git-scm.com/downloads): Version control tool to clone the project's repository.
+
+- A code editor such as [Visual Studio Code](https://code.visualstudio.com/) or [Android Studio](https://developer.android.com/studio) with Flutter and Dart plugins.
+
+## How to Contribute
+
+1. **Fork the Repository**: Start by forking the project's repository to your GitHub account.
+
+2. **Clone the Repository**: Clone the forked repository to your local development environment using the following command:
+
+    ```bash
+    git clone https://github.com/your-username/ultimate-alarm-clock.git
+    ```
+
+3. **Create a Branch**: Create a new branch for your contributions, giving it a descriptive name.
+
+    ```bash
+    git checkout -b your-feature-name
+    ```
+
+4. **Make Changes**: Make your desired changes, improvements, or bug fixes in your local environment.
+
+5. **Test**: Ensure that your changes do not introduce new issues and do not break existing features. Test your code thoroughly.
+
+6. **Documentation**: If your changes impact the user interface, configuration, or functionality, update the documentation to reflect the changes.
+
+7. **Commit**: Commit your changes with a clear and concise message.
+
+    ```bash
+    git commit -m "Add feature/fix: Describe your changes here"
+    ```
+
+8. **Push Changes**: Push your changes to your GitHub fork.
+
+    ```bash
+    git push origin your-feature-name
+    ```
+
+9. **Pull Request**: Create a Pull Request (PR) from your fork to the original repository. Ensure your PR has a clear title and description outlining the changes.
+
+10. **Code Review**: Your PR will undergo code review. Make any necessary adjustments based on feedback.
+
+11. **Merge**: Once your PR is approved, it will be merged into the main project repository.
+
+## Reporting Issues
+
+If you find a bug or have a suggestion for improvement, please create an [issue](https://github.com/CCExtractor/ultimate_alarm_clock/issues/new) on the project's GitHub repository. Be sure to include a clear and detailed description of the problem or enhancement.
+
+We appreciate your contributions to the Ultimate Alarm Clock project, and your help is invaluable in making it even better.
+
+If you have any questions regarding something in the project, do not hesitate to ask :)
+
+## Guidelines
+
+- Be respectful and considerate when contributing and interacting with the community.
+- Follow the project's coding style, conventions, and best practices.
+- Keep your PR focused on a single issue or feature. If you wish to contribute multiple changes, create separate branches and PRs for each.
+- Provide a detailed and clear description of your PR, including the purpose of the changes and any related issues.
+- Ensure that your code is well-documented and that any new features or changes are reflected in the project's documentation.
+- Make sure your contributions do not introduce security vulnerabilities or cause regressions.