Revise README for better structure and content

[Rushikesh-Gade]

Update README to improve clarity and organization.

Issue #, if available:

Description of changes:

Check all that applies:

• Did a review by yourself.
• Added proper tests to cover this PR. (If tests are not applicable, explain.)
• Checked if this PR is a breaking (APIs have been changed) change.
• Checked if this PR will not introduce cross-platform inconsistent behavior.
• Checked if this PR would require a ReadMe/Wiki update.

Check which platforms you have built SDK on to verify the correctness of this PR.

• Linux
• Windows
• Android
• MacOS
• IOS
• Other Platforms

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[sbiscigl]

"Revise README for better structure and content" — what's your criteria for better structure and content, and how does this change adhere to that criteria?

We're all for changes that make measured improvements to the SDK, but this feels like changing the README for the sake of changing it. What problem does this solve for users?