Readme update with latest version requirements and setup steps

[Ayushsanjdev]

Issue Description

This issue involves updating the Java and Node.js versions in readme. Additionally, steps to set up the React Native mobile app will be documented for future reference.

Current Behavior

Outdated documentation.

Expected Behaviour

• Update the readme and proper steps to setup react native in rds mobile app.

Screenshots

n/a

Environment

• Operating System: [e.g., Windows, macOS, Linux]
• Browser (if applicable): [e.g., Chrome, Firefox, Safari]
• Version of Software/Project: [e.g., v1.0.0]

Additional Information

Checklist

• I have read and followed the project's code of conduct.
• I have searched for similar issues before creating this one.
• I have provided all the necessary information to understand and reproduce the issue.
• I am willing to contribute to the resolution of this issue.

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