Update README with Data safety section

[juanchazo]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Fixes b/200620733

Description
A data safety section was added to the readme as external documentation informing users that this SDK does not collect or share any personal or sensitive user data.

Type
Documentation

Checklist

• I have read and acknowledged the Code of conduct
• I have read How to Contribute
• I have read the Developer's guide
• I have signed the Google Individual CLA, or I am covered by my company's Corporate CLA
• I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the style guide of this project
• I have run ./gradlew check and ./gradlew connectedCheck to test my changes locally
• I have built and run the reference app(s) to verify my change fixes the issue and/or does not break the reference app(s)

[codecov]

Codecov Report

Merging #1036 (235316f) into master (0691f75) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1036   +/-   ##
=========================================
  Coverage     84.39%   84.39%           
  Complexity      598      598           
=========================================
  Files           133      133           
  Lines         10284    10284           
  Branches        753      753           
=========================================
  Hits           8679     8679           
  Misses         1221     1221           
  Partials        384      384           

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[jingtang10]

Thanks for the PR @juanchazo!

I wonder if we should include this information as part of the wiki page in each library. For example, the FHIR Engine wiki already includes a security section: https://github.com/google/android-fhir/wiki/FHIR-Engine-Library#privacy--security where this declaration can be a little more detailed and tailored to each library?

[jingtang10]

@fredhersch @jtournier23 fyi

[juanchazo]

Changes made to the wiki instead of readme, closing PR.