docs: add sgreenbury as a contributor for code, ideas, and 2 more

[allcontributors]

Adds @sgreenbury as a contributor for code, ideas, review, projectManagement.

This was requested by radka-j in this comment

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.26%. Comparing base (b61fcf3) to head (28e3a81).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #311      +/-   ##
==========================================
+ Coverage   94.24%   94.26%   +0.02%     
==========================================
  Files          65       65              
  Lines        3752     3752              
==========================================
+ Hits         3536     3537       +1     
+ Misses        216      215       -1     

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[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
autoemulate/emulators
gaussian_process.py
Project Total

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