Update Sample description in README.md

[lethargicpanda]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @lethargicpanda, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the README.md file to improve the clarity and visual appeal of the sample descriptions. It introduces a new, more detailed table format for showcasing individual samples, complete with images and direct links to their code, while also reorganizing existing content for better readability and information flow.

Highlights

• README.md Restructuring: The README.md file has been significantly restructured to enhance the presentation of sample descriptions.
• New Sample Display Format: A new table-based format has been introduced for individual sample descriptions, starting with 'Gemini Image Chat', which includes an image and a direct link to the sample's code.
• Content Reorganization: The 'Requires Firebase setup' section has been repositioned earlier in the document, and the existing bulleted list of samples has been moved to appear after the newly introduced table format.

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[gemini-code-assist]

Code Review

This pull request updates the README.md to feature a new table-based layout for showcasing samples. My review focuses on improving the clarity and formatting of this new section. I've pointed out some duplicated content that arose from this change, an unnecessary empty row in the new table, and a suggestion to improve the readability of the markdown by reducing the use of <br> tags for spacing.

[gemini-code-assist]

Using four consecutive <br> tags for vertical spacing makes the Markdown source a bit difficult to read and maintain. It's generally better to use them sparingly. I've suggested reducing them to two, which should still provide ample spacing.

Suggested change

| **Gemini Image Chat**:<br><br> a sample using the new [Gemini 2.5 Flash Image model](https://developers.googleblog.com/en/introducing-gemini-2-5-flash-image/) (a.k.a. "NanoBanana") enabling image generation and iterations via chat interactions<br><br><br><br> **[> Browse code](samples/gemini-image-chat)**<br><br> | <img src="samples/gemini-image-chat/android_nano_banana.png" width="150" alt="Gemini Image Chat sample"> |

| **Gemini Image Chat**:<br><br> a sample using the new [Gemini 2.5 Flash Image model](https://developers.googleblog.com/en/introducing-gemini-2-5-flash-image/) (a.k.a. "NanoBanana") enabling image generation and iterations via chat interactions<br><br> **[> Browse code](samples/gemini-image-chat)**<br><br> | <img src="samples/gemini-image-chat/android_nano_banana.png" width="150" alt="Gemini Image Chat sample"> |

[gemini-code-assist]

This empty table row appears to be unnecessary and adds extra vertical space. It should be removed for cleaner formatting.

[gemini-code-assist]

This gemini-image-chat sample is already described in detail in the new table format above. To avoid content duplication and potential confusion for readers, this list item should be removed.

[lethargicpanda]

This was merged in a separate PR.