example in docs

[cossio]

The ForwardDiff docs are a bit strange: Introduction has no usage example, first entry of "User Documentation" is Limitations, then API reference, and then an Advanced section. Would be nice to start instead with a simple usage example.

I just copy/pasted the example from the README. I think this will be helpful for users that land on the docs page of the package without having seen the readme.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e3670ce) 89.65% compared to head (e76c727) 89.65%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #657   +/-   ##
=======================================
  Coverage   89.65%   89.65%           
=======================================
  Files          11       11           
  Lines         967      967           
=======================================
  Hits          867      867           
  Misses        100      100           

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

[gdalle]

Thanks for the contribution!