🔐 Added Security Policy

SECURITY.md

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+# 🔐 Security Policy
+
+## 📦 Project: [checkcle](https://github.com/operacle/checkcle)
+
+**checkcle** is a lightweight, TypeScript-based built for uptime and server monitoring tools.
+
+We care about the security and privacy of users running this project in production environments.
+
+---
+
+## 📣 Reporting a Vulnerability
+
+If you believe you have found a security vulnerability in this project:
+
+- **DO NOT** open a public issue to report it.
+- Please report it responsibly via one of the following methods:
+
+### 🔐 Preferred: [Report a Vulnerability via GitHub](https://github.com/operacle/checkcle/security/advisories/new)
+
+- Use the GitHub security advisory form (private and secure).
+- Attach as much detail as possible:
+  - Description of the issue
+  - Affected version or commit hash
+  - Reproduction steps
+  - Impact and any potential mitigations
+  - Logs or screenshots (if available)
+
+### 📧 Alternatively: Contact the Maintainer
+- Email: `security@checkcle.io` 
+- Optionally include a PGP public key for encrypted messages
+
+We aim to respond within **3–5 business days**.
+
+---
+
+## ✅ Supported Versions
+
+We support the latest stable release of `checkcle`. Security patches may also be applied to recent versions at our discretion.
+
+| Version | Supported |
+|---------|-----------|
+| `main` (latest) | ✅ Yes |
+| Older versions | ⚠️ Best-effort |
+| Pre-release or forks | ❌ No |
+
+---
+
+## 🔍 Security Practices
+
+This project adheres to the following practices to enhance security:
+
+- 🔎 Regular vulnerability checks using `npm audit`
+- ⛓️ Dependency pinning via `package-lock.json`
+- ✅ Type-safe code using `TypeScript`
+- 🧪 Continuous testing and CI
+- 🔐 No data is stored or transmitted unless explicitly configured by the user
+- 🧑‍💻 All contributions are reviewed before being merged
+
+---
+
+## ⚠️ Known Security Limitations
+
+- `checkcle` makes outbound HTTPS requests to check certificate details — avoid running in untrusted or high-risk environments without proper network policies.
+- Output may contain certificate metadata (e.g., CN, SANs, expiry dates) — avoid exposing this to public logs unless sanitized.
+- The data may be lost upon system restarts or crashes. Always ensure that backup and recovery mechanisms are in place in production environments.
+
+---
+
+## 📄 License
+
+This project is released under the [MIT License](./LICENSE). Use at your own risk. The Creator and contributors are not liable for misuse, data loss, or operational impact resulting from use of the software.
+
+---
+
+## 🙌 Acknowledgements
+
+We appreciate responsible disclosures from the community. Your efforts help us make the open-source ecosystem safer for everyone.
+
+Thanks & Regards,
+
+— [Tola Leng](https://github.com/tolaleng)