fix: Fix build of HistogramExample

[hassila]

Description

Fix forgotten rename of main.swift, add Package.resolved to git.

How Has This Been Tested?

Manually verified running of HistogramExample.

Minimal checklist:

• I have performed a self-review of my own code
• I have added DocC code-level documentation for any public interfaces exported by the package
• I have added unit and/or integration tests that prove my fix is effective or that my feature works

[codecov]

Codecov Report

Merging #1 (1d025f3) into main (a97cced) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #1   +/-   ##
=======================================
  Coverage   92.60%   92.60%           
=======================================
  Files           5        5           
  Lines        1540     1540           
=======================================
  Hits         1426     1426           
  Misses        114      114           

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