feat(isMobilePhone): Add Central African Republic Locale And Prefix(CF)

[cheboi]

added validation and test for isMobilePhone code Locale for Central African Republic (CF).
reference doc:
https://www.wikiwand.com/en/Telephone_numbers_in_the_Central_African_Republic
https://freetools.textmagic.com/phone-validator

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (1138a0f) compared to base (54d330c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2176   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          105       105           
  Lines         2324      2324           
  Branches       586       586           
=========================================
  Hits          2324      2324           

Impacted Files	Coverage Δ
src/lib/isMobilePhone.js	100.00% <ø> (ø)

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[ezkemboi]

Add details to README.md

[profnandaa]

Merging, will update the README manually, to avoid potential merge conflicts.