Repo: add Vulnerability Response Process
Created by: anonimal
As discussed in Kovri meetings, IRC, https://github.com/monero-project/monero/pull/1995, https://github.com/monero-project/monero-core/pull/778, and https://github.com/monero-project/meta/issues/39: here is a formalized VRP. This VRP will aid us in working with researchers and HackerOne.
RFC, WIP.