added proposal for AI UI Generator with the supporting images.

[SyedAbdullah58-dev]

PR Description

The Proposal has all the details and the supporting images

Related Issues

#617

• Closes #

Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with project main branch before making this PR
• I am using the latest Flutter stable branch (run flutter upgrade and verify)
• I have run the tests (flutter test) and all tests are passing

Added/updated tests?

We encourage you to add relevant test cases.

• Yes
• No, and this is why: please replace this line with details on why tests have not been included

OS on which you have developed and tested the feature?

• Windows
• macOS
• Linux

[animator]

@SyedAbdullah58-dev The proposal looks good. You can go ahead and submit it in the GSoC website.