mrc-6113 jsonschema and api docs

[EmmaLRussell]

NB based on #4

[codecov]

Codecov Report

Attention: Patch coverage is 97.40260% with 2 lines in your changes missing coverage. Please review.

Project coverage is 98.41%. Comparing base (76fd79f) to head (44ea706).

Files with missing lines	Patch %	Lines
src/routes.ts	60.00%	2 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                  @@
##           mrc-6089-codecov       #6      +/-   ##
====================================================
- Coverage            100.00%   98.41%   -1.59%     
====================================================
  Files                     7       15       +8     
  Lines                    61      126      +65     
  Branches                  7       15       +8     
====================================================
+ Hits                     61      124      +63     
- Misses                    0        2       +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.