Adds Neon ISA example

[rtzam]

This CL adds the Neon equivalent
of the x86-AVX example. It changes
the Makefile to build the neon
example. It also modifies
the provided main.c file
to work for either the
generated neon or avx code

[yamaguchi1024]

We probably need to clean up the Python code and modify the readme to point to the Neon example. I think we should merge the documentation / tutorial changes at once.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.78%. Comparing base (37dc108) to head (672a2ac).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #695   +/-   ##
=======================================
  Coverage   87.78%   87.78%           
=======================================
  Files          84       84           
  Lines       20721    20721           
=======================================
  Hits        18190    18190           
  Misses       2531     2531           

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[gilbo]

The README.md file is out of sync with the code. Let's discuss a path to getting this committed ASAP in person. I can share an optional code rewrite with some alternate comments as well.