Add direct links to Python and C APIs from README

[hyanwong]

I use these a fair bit

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.72%. Comparing base (65b4cae) to head (666ce2e). Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2887   +/-   ##
=======================================
  Coverage   89.72%   89.72%           
=======================================
  Files          29       29           
  Lines       31573    31573           
  Branches     6115     6115           
=======================================
  Hits        28328    28328           
  Misses       1853     1853           
  Partials     1392     1392           

Flag	Coverage Δ
c-tests	86.55% <ø> (ø)
lwt-tests	80.78% <ø> (ø)
python-c-tests	88.98% <ø> (ø)
python-tests	99.01% <ø> (ø)

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[benjeffery]

@mergifyio rebase

[mergify[bot]]

rebase

✅ Branch has been successfully rebased