Update contributing.md

[ndegwamartin]

Update the developer contribution

Fixes #565

Type
Choose one: Documentation

Checklist

• I have written Unit tests for any new feature(s) and edge cases for bug fixes
• I have added any strings visible on UI components to the strings.xml file
• I have updated the CHANGELOG.md file for any notable changes to the codebase
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the project's style guide
• I have built and run the fhircore app to verify my change fixes the issue and/or does not break the app

[codecov]

Codecov Report

Merging #588 (32fe1fe) into main (7f4c569) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #588   +/-   ##
=========================================
  Coverage     35.14%   35.14%           
  Complexity      339      339           
=========================================
  Files           130      130           
  Lines          3594     3594           
  Branches        506      506           
=========================================
  Hits           1263     1263           
  Misses         2189     2189           
  Partials        142      142           

Flag	Coverage Δ
anc	53.16% <ø> (ø)
eir	59.08% <ø> (ø)
engine	11.92% <ø> (ø)

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