Add a discussion link to the website and to the ReadMe

[keithrfung]

Feature Request

Is your feature request related to a problem? Please describe. We'd like the Discussions page to be more evident to new users so they know that's the place to discuss questions regarding the specification.

Describe the solution you'd like

• Add a link in the Contributing section of the Readme.md
• Add a link in the Contributing section of the index.md
• Friendly wording to encourage people to asks questions and make suggestions

This would be the link: https://github.com/microsoft/electionguard/discussions

[96RadhikaJadhav]

@keithrfung Can I work on the issue? Also could you please explain exactly where and how much lines of wording have to add?