docs: Learner Credit Management data and routing ADR

[adamstankiewicz]

Description

ADR about data and routing implications for Learner Credit Management feature.

Formatted ADR Preview

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)

Only if submitting a visual change

• Ensure to attach screenshots
• Ensure to have UX team confirm screenshots

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (31f4dc8) 82.89% compared to head (634fb71) 82.89%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1026   +/-   ##
=======================================
  Coverage   82.89%   82.89%           
=======================================
  Files         402      402           
  Lines        8735     8735           
  Branches     1805     1805           
=======================================
  Hits         7241     7241           
  Misses       1455     1455           
  Partials       39       39           

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