Add SECURITY.md about jeepay

[Veloideu]

Hello, @JamieSlome

I created SECURITY.md as you requested.

thank you.

url : https://github.com/jeequan/jeepay/blob/f6c4b5620e9c21e0c41861e8032c69fcfdf8dc16/SECURITY.md

[JamieSlome]

@Veloideu - just for clarity, we do not require a SECURITY.md from you, but from the maintainers of the project.

No details of your report should be shared publicly unless the maintainer is happy for you to do so 👍

[Veloideu]

all right.
Thank you for your kind reply.