Added readme for integration tests

[JoeBatt1989]

Description

Read me for integration tests

A few sentences describing the changes proposed in this pull request.

Status

*Ready

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• All tests passed locally.
• Documentation comments included/updated.

[codecov]

Codecov Report

Merging #418 (d365e88) into develop (9009148) will decrease coverage by 0.00636%.
The diff coverage is n/a.

@@                 Coverage Diff                 @@
##             develop        #418         +/-   ##
===================================================
- Coverage   57.13468%   57.12832%   -0.00637%     
===================================================
  Files            125         125                 
  Lines          15726       15726                 
  Branches        1672        1672                 
===================================================
- Hits            8985        8984          -1     
- Misses          6462        6463          +1     
  Partials         279         279                 

Flag	Coverage Δ
unittests	57.12832% <ø> (-0.00637%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...vices/DataRetentionService/DataRetentionService.cs	91.17647% <0.00000%> (-2.94119%)	⬇️

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[sonarqubecloud]

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