Updated developers instructions w/ licensing requirements

[mambelli]

Updated the developers' instructions w/ license maintenance information, using REUSE to add and verify compliance.

[codecov]

Codecov Report

Merging #581 (2746d07) into master (e66b985) will decrease coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #581      +/-   ##
==========================================
- Coverage   83.97%   83.78%   -0.19%     
==========================================
  Files          45       45              
  Lines        2702     2702              
  Branches      484      484              
==========================================
- Hits         2269     2264       -5     
- Misses        391      394       +3     
- Partials       42       44       +2     

Flag	Coverage Δ
python-3.10	83.71% <ø> (ø)
python-3.6	83.45% <ø> (-0.19%)	⬇️

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Impacted Files	Coverage Δ
...ecisionengine/framework/taskmanager/TaskManager.py	91.72% <0.00%> (-1.73%)	⬇️

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