Create SECURITY.md for security policy

[vibhorjoshi]

Added a security policy document outlining supported versions and vulnerability reporting.

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Closes: #issue number that will be closed through this PR

Describe the add-ons or changes you've made

Give a clear description of what have you added or modifications made

Type of change

What sort of change have you made:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Describe how it has been tested
Describe how have you verified the changes made

Checklist:

• My code follows the guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly wherever it was hard to understand.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added things that prove my fix is effective or that my feature works.
• Any dependent changes have been merged and published in downstream modules.