Add documentation to the info and includes modules.

[MrShwhale]

Also added the README example to the lib.rs page.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.72%. Comparing base (4f28506) to head (8fcb858).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #10   +/-   ##
=======================================
  Coverage   76.72%   76.72%           
=======================================
  Files         209      209           
  Lines        5516     5513    -3     
=======================================
- Hits         4232     4230    -2     
+ Misses       1284     1283    -1     

Flag	Coverage Δ
ftml	76.72% <100.00%> (+<0.01%)	⬆️

Files	Coverage Δ
src/includes/include_ref.rs	61.53% <ø> (ø)
src/includes/includer/debug.rs	100.00% <ø> (ø)
src/includes/includer/null.rs	0.00% <ø> (ø)
src/includes/mod.rs	83.92% <100.00%> (ø)
src/includes/parse.rs	91.89% <100.00%> (ø)
src/info.rs	46.66% <ø> (+2.91%)	⬆️
src/lib.rs	20.00% <ø> (ø)

... and 2 files with indirect coverage changes