chore: create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contribute to the development of anjana
+
+If this library is being useful for your research and you want to contribute to its improvement, we are happy to receive your proposals! Below you will find a guide on how you can contribute to improving anjana.
+
+### Add a new feature
+
+If you are using anjana and have developed a new feature (especially implementing an additional anonymity functionality), and you want to contribute to the community, follow the steps below:
+1. Fork the repository
+2. Clone the local repository:
+
+   ```bash
+   git clone https://github.com/your-user/anjana.git
+
+3. Set up a virtual environment and install the requirements:
+
+    ```bash
+    cd anjana
+    virtualenv .venv -p python3
+    source .venv/bin/activate
+    pip install -e .
+
+4. Create a new brach (e.g. develop)
+
+     ```bash
+     git checkout -b develop
+
+5. Add the functionalities you want to contribute.
+6. Include commits that are descriptive and clear about the changes made and functionality added. Make sure you create Semantic Commit Messages (conventional commits) including the use of flags such as `feat`, `fix`, `refactor`, `test`, etc
+7. Check the style and that linting is successfully executed by using `tox`.
+8. Check that the code coverage is greater than 90%:
+
+     ```bash
+     pytest --cov=.
+
+9. Send your code to your fork:
+
+    ```bash
+    git push
+
+10. Open a [pull request](https://github.com/IFCA-Advanced-Computing/anjana/pulls) from your fork.
+
+### Solve a bug
+
+If you have found a bug with some functionality of the library, it is recommended that you open an [issue](https://github.com/IFCA-Advanced-Computing/anjana/issues) so that we can solve it. You can follow the next steps: 
+1. First, check that it is not an open [issue](https://github.com/IFCA-Advanced-Computing/anjana/issues) or one that has been previously resolved.
+2. Give us information about the issue: clearly describe what you expected to receive and the error that occurred.
+3. Describe clearly the steps that will allow us to reproduce your error, indicating the function you are using and details about the input introduced. 
+4. Provide us details about the computing environment used: operating system, version of Python used and version of Anajan used.  
+
+Any additional details you consider important will help us to resolve it more quickly.
+
+### Suggest a new feature:
+
+If you are missing some functionality that you would like to see implemented in anjana, you can request it by opening an [issue](https://github.com/IFCA-Advanced-Computing/anjana/issues) as indicated in the previous section.
+1. check that this functionality is not included or has not been previously requested in another issue.
+2. Give us information about the required functionality, including why it is important for the users to have it be available in anjana.
+3. Include theoretical information about the new technique or feature requested, including papers supporting its usefulness.
+
+
+