Update README

[abejgonzalez]

Related issue:

Type of change: bug fix + other enhancement

Impact: other

Release Notes
Fixes issue where README shown would default to the .github/README.md instead of the top-level README.md. Additionally adds a new section at the top of the README.md for quick links. My reasoning for adding this is that it makes it extremely easy to find the link to the mailing list (called forum here) for people who don't care to read down the README.md. This aligns with #1029 where I pointed to the mailing list more.

[jerryz123]

What is the README bug? Having multiple READMEs should be supported.

[abejgonzalez]

What is the README bug? Having multiple READMEs should be supported.

If there is a README in the .github area, it will show that one by default instead of the one in the top-level of the repo.

[jerryz123]

Its useful to have README.md in the subdirectories, as it shows up when you browse there in Github, I think this may be a one-off rendering bug, rather than a repo bug.

Here's a screenshot of what I mean. If you rename it this will not longer show up.

[abejgonzalez]

Its useful to have README.md in the subdirectories, as it shows up when you browse there in Github, I think this may be a one-off rendering bug, rather than a repo bug.

Here's a screenshot of what I mean. If you rename it this will not longer show up.

I agree, but I think this is an issue with the priority of the .github vs the root directory README.md file... I would look at the two PR commits to see the difference.