add min sdk level for paywalls and customer center

[mshmoustafa]

Checklist

• If applicable, unit tests
• If applicable, create follow-up issues for purchases-ios and hybrids

Motivation

Description

We document the minimum API level for Paywalls and Customer Center in our docs, so I'm replicating that info here for convenience

[Copilot]

Pull Request Overview

This PR updates the README documentation to include the minimum SDK level for Paywalls and Customer Center for Android.

• Added a documentation note about the new minimum target API level (Android 7.0+ / API level 24+).

Comments suppressed due to low confidence (1)

README.md:55

• [nitpick] The additional indentation makes this a sub-bullet relative to the minimum target for Android. Clarify if this nested formatting is intentional; if not, adjust the indentation to match the primary list formatting.

    - Paywalls and Customer Center minimum target: Android 7.0+ (API level 24+)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.72%. Comparing base (33c7458) to head (47de2a9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2465   +/-   ##
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  Coverage   78.72%   78.72%           
=======================================
  Files         289      289           
  Lines       10519    10519           
  Branches     1509     1509           
=======================================
  Hits         8281     8281           
  Misses       1590     1590           
  Partials      648      648           

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