docs(security): Document security processes (#160)

Signed-off-by: Michele Dolfi <97102151+dolfim-ibm@users.noreply.github.com>

Author: dolfim-ibm

.github/SECURITY.md

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+# Security and Disclosure Information Policy for the Docling Project
+
+The Docling team and community take security bugs seriously. We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
+
+## Supported Versions
+
+The latest versions of all Docling repositories are supported.
+
+### Security
+
+- Participation in the [OpenSSF Best Practices Badge Program](https://bestpractices.coreinfrastructure.org/en/projects/10101) for Free/Libre and FLOSS projects to ensure that we follow current best practices for quality and security
+- Use of [HTTPS](https://en.wikipedia.org/wiki/HTTPS) for network communication
+- Use of secure protocols for network communication (through the use of HTTPS)
+- Up-to-date support for TLS/SSL (through the use of [OpenSSL](https://www.openssl.org/))
+- Performance of TLS certificate verification by default before sending HTTP headers with private information (through the use of OpenSSL and HTTPS)
+- Distribution of the software via cryptographically signed releases (on the [PyPI](https://pypi.org/), [Quay.io](https://quay.io/organization/docling-project/) and [GHCR.io](https://github.com/orgs/docling-project/packages) package repositories)
+- Use of [GitHub](https://github.com/) Issues for vulnerability reporting and tracking
+
+### Analysis
+
+- Use of [Ruff](https://docs.astral.sh/ruff/), [Mypy](https://mypy.readthedocs.io/) and [Pytest](https://docs.pytest.org/en/7.2.x/) for Python code linting (static and dynamic analysers) on pull requests and builds
+- Use of GitHub Issues for bug reporting and tracking
+
+## Reporting a Vulnerability
+
+If you think you've identified a security issue in any Docling project repository, please DO NOT report the issue publicly via the GitHub issue tracker, discussions, or any other public forum.
+
+### Preferred Method: GitHub Private Vulnerability Reporting
+
+**We strongly encourage you to use GitHub's Private Vulnerability Reporting feature**, which provides a secure and streamlined process for disclosing security issues:
+
+1. Navigate to the **Security tab** of the specific Docling repository where the vulnerability exists (e.g., `https://github.com/docling-project/<repository-name>/security`)
+   - For example: [docling](https://github.com/docling-project/docling/security), [docling-core](https://github.com/docling-project/docling-core/security), [docling-parse](https://github.com/docling-project/docling-parse/security), etc.
+2. Click on "Report a vulnerability"
+3. Fill out the vulnerability report form with as many details as possible
+4. Submit the report
+
+This method allows for:
+- **Secure communication** directly with the maintainers team
+- **Coordinated disclosure** through GitHub's built-in workflow
+- **Automatic tracking** of the vulnerability lifecycle
+- **Credit attribution** when the vulnerability is published
+
+### Alternative Method: Email Disclosure
+
+Alternatively, you can send an email with as many details as possible to [deepsearch-core@zurich.ibm.com](mailto:deepsearch-core@zurich.ibm.com). This is a private mailing list for the maintainers team.
+
+**Important:** Please do not create a public issue or discuss the vulnerability in any public channel until it has been addressed.
+
+### Security Vulnerability Response
+
+Each report is acknowledged and analyzed by the core maintainers within 3 working days.
+
+Any vulnerability information shared with core maintainers stays within the Docling project and will not be disseminated to other projects unless it is necessary to get the issue fixed.
+
+After the initial reply to your report, the security team will keep you informed of the progress towards a fix and full announcement, and may ask for additional information or guidance.
+
+## Security Alerts
+
+We will send announcements of security vulnerabilities and steps to remediate on the [Docling announcements](https://github.com/docling-project/docling/discussions/categories/announcements).