Create SECURITY.md

[Saf9933]

This commit introduces a SECURITY.md file to guide the responsible disclosure and handling of vulnerabilities in mLoRA.

Key highlights:

• Users are encouraged to report issues such as data poisoning, pipeline parallelism security risks, and container vulnerabilities.
• Clear instructions are provided for reporting vulnerabilities via email or confidential GitHub issues.
• Areas of concern include Docker security, API misuse, and credential management.
• Guidelines are established for investigating and patching reported vulnerabilities.

The policy aims to improve the security posture of the project and provide contributors and users with a responsible process for addressing security risks.