PTRS Examples Directory

[jmwample]

This PR makes an effort to clarify the PTRS examples.

The examples (including passthrough.rs) are moved to the expected project location in crates/ptrs/examples.

A README is added to do a better job of explaining the examples provided

More example (skeletons) are added to demonstrate (and ensure) the flexibility of the PTRS library.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.97%. Comparing base (9ee2d0e) to head (3f8a341).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   78.51%   78.97%   +0.46%     
==========================================
  Files          35       34       -1     
  Lines        5687     5009     -678     
  Branches     5687     5009     -678     
==========================================
- Hits         4465     3956     -509     
+ Misses        831      792      -39     
+ Partials      391      261     -130     

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