docs: add more timezone tests and update readme for the PhoneNumberToTimeZonesMapper

[wmundev]

Changes

• docs: add more timezone tests and update readme for the PhoneNumberToTimeZonesMapper

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.27%. Comparing base (cadd7f2) to head (79779bc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #321   +/-   ##
=======================================
  Coverage   75.27%   75.27%           
=======================================
  Files          34       34           
  Lines        4424     4424           
  Branches     1001     1001           
=======================================
  Hits         3330     3330           
  Misses        885      885           
  Partials      209      209           

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