CONTRIBUTING.md missing

[krsjoseph]

The CONTRIBUTING.md file seems to be missing or link is broken.

[pesho]

Will be fixed once #382 and/or #393 gets merged.

[krsjoseph]

Thanks @pesho

[pesho]

Np @krsjoseph. Reopening until actually resolved, because the issue is valid.

[pesho]

Resolved via #393