Create six-month-review.md

[tms-epcc]

Added Github issue template for six month reviews

Review Checklist for Source Code Changes

N/A

• Does pip install still work?
• Have you written a unit test for any new functions?
• Do all the units tests run successfully?
• Does adler run successfully on a test set of input files/databases?
• Have you used black on the files you have updated to confirm python programming style guide enforcement?

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.32%. Comparing base (7f0094b) to head (84734e3).
Report is 71 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
+ Coverage   84.71%   87.32%   +2.60%     
==========================================
  Files          14       17       +3     
  Lines         373      639     +266     
==========================================
+ Hits          316      558     +242     
- Misses         57       81      +24     

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