Completed test case CG15

[MattMiss]

Description

Added CG15 test case in readingsCompareGroupFlow.js

Partly Addresses #962

Type of change

• Note merging this changes the database configuration.
• This change requires a documentation update

Checklist

• I have followed the OED pull request ideas
• I have removed text in ( ) from the issue request
• You acknowledge that every person contributing to this work has signed the OED Contributing License Agreement and each author is listed in the Description section.

Limitations

None

[huss]

Thanks to @MattMiss for their first contribution to OED. Review and testing found it works as expected. I made one small comment on a string to address.

[huss]

Thanks to @MattMiss for the updated code. Everything looks good. Congratulations on your first accepted contribution to OED.