Work-in-Progress, added code to test B12 CSV file.

[ThatCodebyTony]

Description

Added test code for the B12 CSV file.

[issue]

Not sure if line 123 is correct unit. unsure if line 125 is the pathway to the correct csv file.

Type of change

(Check the ones that apply by placing an "x" instead of the space in the [ ] so it becomes [x])

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

Checklist

(Note what you have done by placing an "x" instead of the space in the [ ] so it becomes [x]. It is hoped you do all of them.)

• [X] I have followed the OED pull request ideas
• [ ] I have removed text in ( ) from the issue request
• [X] 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

(Describe any issues that remain or work that should still be done.)