Add PQ-TLS macOS/Windows compatibility note to README

[vedant-jaiswal]

Description

Why is this change being made?

1. Users attempting to use PQ-TLS on macOS or Windows may encounter unexpected behavior due to AWS CRT system library dependencies. This note proactively informs users of the known limitation.

What is changing?

1. 1. Added a note in the "Enabling Post-Quantum TLS" section of the README warning that PQ-TLS may not work as expected on macOS or Windows due to AWS CRT system library dependencies, with a reference link.

Related Links

• Issue #, if available:

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Testing

How was this tested?

1. Documentation-only change

When testing locally, provide testing artifact(s):

1. Verified README renders correctly using VS Code Markdown preview.

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Reviewee Checklist

Update the checklist after submitting the PR

• I have reviewed, tested and understand all changes
  If not, why:
• I have filled out the Description and Testing sections above
  If not, why:
• Build and Unit tests are passing
  If not, why:
• Unit test coverage check is passing
  If not, why:
• I have ensured no sensitive information is leaking (i.e., no logging of sensitive fields, or otherwise)
  If not, why:
• I have added explanatory comments for complex logic, new classes/methods and new tests
  If not, why:
• I have updated README/documentation (if needed)
  If not, why:
• I have clearly called out breaking changes (if any)
  If not, why:

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Reviewer Checklist

All reviewers please ensure the following are true before reviewing:

• Reviewee checklist has been accurately filled out
• Code changes align with stated purpose in description
• Test coverage adequately validates the changes

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.83%. Comparing base (4bc213f) to head (bde9262).
⚠️ Report is 1 commits behind head on v2.

Additional details and impacted files

@@            Coverage Diff            @@
##                 v2     #196   +/-   ##
=========================================
  Coverage     91.83%   91.83%           
  Complexity       97       97           
=========================================
  Files             6        6           
  Lines           245      245           
  Branches         26       26           
=========================================
  Hits            225      225           
  Misses           18       18           
  Partials          2        2           

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