Outline a responsible procedure for reporting security vulnerabilities

[0xMurage]

Is your feature request related to a problem? Please describe.
There is currently no guideline on how to report an identified platform security vulnerability on contributing guide

Describe the solution you'd like
Outline responsible procedure for disclosing security vulnerabilities on the contributing guide

Describe alternatives you've considered
Wikonnect could adopt coordinated vulnerability disclosure policy so a fix can be done before disclosing with various platform stakeholders.

[brianmarete]

This repo is a good resource for tackling this issue