docs: add edwardchalstrey1 as a contributor for code, design, and 2 more

[allcontributors]

Adds @edwardchalstrey1 as a contributor for code, design, review, doc.

This was requested by radka-j in this comment

[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

This report was generated by python-coverage-comment-action

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.23%. Comparing base (0523ca4) to head (0d0f664).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #334      +/-   ##
==========================================
- Coverage   94.25%   94.23%   -0.03%     
==========================================
  Files          65       65              
  Lines        3780     3780              
==========================================
- Hits         3563     3562       -1     
- Misses        217      218       +1     

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