Add security note to repository

In order to simplify the communication with security researcher and
allow reporting of issues, this document should provide a rough idea
about:

1. What versions are supported
2. Who to contact
3. How to send findings properly secured
4. What to expect from an approved security issue
5. What if it's not considered a security issue

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

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