docs: update readme to include minSdk requirement note for v2.0.0

[vgupta98]

Description

This PR updates the README file to include a note for minimum SDK version requirement for v2.0.0 of braze integration (which is 25). It also correctly formats the README.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• Version upgraded (project, README, gradle, podspec etc)
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added unit tests for the code
• I have made corresponding changes to the documentation

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull Request Overview

This PR updates the README to clearly document the minimum SDK version required for Braze integration v2.0.0 and improves code block formatting.

• Updated dependency version for Braze integration from 1.0.8 to 2.0.0
• Added a note detailing that Braze integration v2.0.0 and above require a minimum SDK version of 25
• Enhanced code block language annotation for improved readability