chore: Introduce SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+ESP-MQTT is distributed as an [ESP-IDF component](https://components.espressif.com/components/espressif/mqtt/versions/1.1.0/readme) and through the ESP-IDF Component Registry.
+
+When ESP-MQTT is used as part of ESP-IDF, please refer to the [ESP-IDF Support Period Policy](https://github.com/espressif/esp-idf/blob/master/SUPPORT_POLICY.md)
+for information about supported ESP-IDF versions.
+
+For the managed ESP-MQTT component, users are encouraged to use the latest available release.
+
+## Reporting a Vulnerability
+
+Please follow the [Espressif Security Incident Response Process](https://www.espressif.com/en/support/documents/advisories) to
+report a suspected security vulnerability.
+
+Please **do not create a public GitHub issue, discussion, or pull request** for a security vulnerability.
+
+When reporting an issue related to ESP-MQTT, please provide as much
+relevant information as possible, including:
+
+- The affected ESP-MQTT version or commit
+- The ESP-IDF version, if applicable
+- The affected SoC or target
+- A description of the vulnerability and its potential security impact
+- Configuration required to reproduce the issue
+- Steps to reproduce the issue
+- A proof of concept, logs, or other supporting information, if
+  available
+
+If you are unsure whether an issue has security implications, please
+report it through the security reporting process rather than disclosing
+it publicly.