Create Contributing,yml

[gniumg-source]

@tjohns #1786
@sqrrrl #1794
@asrivas #1792
@camac #1793
@grant #1791

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.
List any dependencies that are required for this change.

Fixes # (issue)

Is it been tested?

• [• ] Development testing done

Checklist

• [ •] My code follows the style guidelines of this project
• [• ] I have performed a self-review of my own code
• [ •] I have performed a peer-reviewed with team member(s)
• [ •] I have commented my code, particularly in hard-to-understand areas
• [• ] I have made corresponding changes to the documentation
• [ •] My changes generate no new warnings
• [ •] Any dependent changes have been merged and published in downstream modules

[gniumg-source]

• gh pr checkout 1795