Add discussion section

[pastorsj]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report 
[x] Feature request
[ ] Support request

Current behavior

Currently, a user is unable to discuss an article posted on the site.

Expected behavior

Exactly the opposite of the above statement

What is the motivation for this change?

Environment

Browser:
- [ ] Chrome (desktop) version XX
- [ ] Firefox version XX
- [ ] Safari (desktop) version XX
- [ ] Edge version XX
 
For Tooling issues:
- Node version: XX 
- Platform: 

Others:

[pastorsj]

A user needs to be registered to be able to post comments on an article