Create SECURITY.md

[SimardeepSingh-zsh]

This pull request introduces an update to our SECURITY.md file to provide a more comprehensive and detailed security policy.

The main changes include:

• A detailed introduction about the importance of security in our project.
• Clear instructions on how to report a vulnerability, including the format of the report and what to expect in terms of response time and updates.
• An explanation of our commitment to maintaining the security of our project, including regular audits and updates.

This update aims to make our security policy more transparent and understandable, thereby encouraging responsible vulnerability reporting and fostering a safer community.

[amark]

@SimardeepSingh-zsh nice idea! Willing to do a follow up PR fixing the "versions" to 0.2020.x?