create securit.yml

[ShayneMichaelBacik1]

Security Policy

Supported Versions

Use this section to tell people about which versions of your project are currently being supported with security updates.

Version	Supported
5.1.x	:white_check_mark:
5.0.x	:x:
4.0.x	:white_check_mark:
< 4.0	:x:

Reporting a Vulnerability

Use this section to tell people how to report a vulnerability.

Tell them where to go, how often they can expect to get an update on a reported vulnerability, what to expect if the vulnerability is accepted or declined, etc.

Description

• A brief description of the task/issue
• https://linear.app/metaplex/issue/{LINEAR_ISSUE_ID}

Work Completed

• a brief description of all the work completed in this PR

API Changes

• A list of any changes made to the public API
• remove this section if no changes to the public API

Testing

• List all testing procedures that were performed to validate the AC