Update ISO3DFD readme - unguided version

[jkinsky]

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Existing Sample Changes

Description

Restructured to match new template. Rewrote some sections for clarity. Updated headings and fixed formatting issues.

Fixes Issue#

External Dependencies

N/A

Type of change

Please delete options that are not relevant. Add a 'X' to the one that is applicable.

• [X] Documentation

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [x] Command Line
• [x] oneapi-cli
• [x] Visual Studio
• [x] VSCode

[jkinsky]

@ishaghosh27 please review. Adding @jimmytwei for notices.

[jimmytwei]

@ishaghosh27 Going through the PRs. Did you get a chance to review this?