Readme update

[lethargicpanda]

Update main Readme.md file to include screenshot and more elaborate description for each sample.

[lethargicpanda]

cc @JolandaVerhoef

[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 significantly improves the README.md file by revamping how the various AI samples are presented. The update transitions from a basic text list to a comprehensive markdown table, integrating screenshots and more elaborate descriptions for each sample. This change aims to provide a clearer, more informative, and visually engaging overview for users exploring the AI catalog.

Highlights

• Enhanced Sample Descriptions: The previous concise list of samples has been replaced with a more detailed and visually appealing table format.
• Visual Aids for Samples: Each sample now includes a dedicated screenshot, providing a quick visual reference for its functionality.
• Improved Sample Information: The descriptions for each sample have been expanded to offer more context, including relevant model details, use cases, and direct links to browse the sample's code.

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[gemini-code-assist]

Code Review

This pull request updates the main README.md to provide a more visually appealing and descriptive list of the available samples, using a table with screenshots. The changes are a good improvement, but I've found a few small issues like a broken link, a typo, a grammatical error, and incorrect alt text. I've also suggested a way to clean up the Markdown for better maintainability.

[gemini-code-assist]

The link for 'multimodal capabilities' is broken due to incorrect Markdown syntax. It contains a nested, invalid [url](...) structure.

Suggested change

| <img src="samples/gemini-multimodal/gemini_multimodal.png" width="150" alt="Gemini Multimodal sample"> | ✨📸 **Gemini Multimodal**:<br>A sample leveraging the [multimodal capabilities]([url](https://developer.android.com/ai/gemini/developer-api#generate-text-from-media) of the Gemini Flash model (in this case text and image-to-text) to let you prompt the model with an image.<br><br><br><br> **[> Browse code](samples/gemini-multimodal)**<br><br> |

| <img src="samples/gemini-multimodal/gemini_multimodal.png" width="150" alt="Gemini Multimodal sample"> | ✨📸 **Gemini Multimodal**:<br>A sample leveraging the [multimodal capabilities](https://developer.android.com/ai/gemini/developer-api#generate-text-from-media) of the Gemini Flash model (in this case text and image-to-text) to let you prompt the model with an image.<br><br><br><br> **[> Browse code](samples/gemini-multimodal)**<br><br> |

[gemini-code-assist]

This empty table row, which contains only spaces, is used for adding vertical separation. This pattern is repeated for each sample, which adds unnecessary lines and clutter to the Markdown source, making it harder to maintain. Consider removing these spacer rows and instead add an extra <br> tag within the description cell above if more spacing is desired.

[gemini-code-assist]

There's a small grammatical error in the description. 'summarizing' should be 'summarize' to be grammatically correct in this context.

Suggested change

	| <img src="samples/genai-summarization/nano_summarization.png" width="150" alt="Gemini Nano summarization sample"> | ✨📱📰 **On-device Summarization**: <br>A sample letting you summarizing text on-device using Gemini Nano via the [GenAI Summarization API](https://developers.google.com/ml-kit/genai/summarization/android).<br><br><br><br> **[> Browse code](samples/genai-summarization)**<br><br> |
	| <img src="samples/genai-summarization/nano_summarization.png" width="150" alt="Gemini Nano summarization sample"> | ✨📱📰 **On-device Summarization**: <br>A sample letting you summarize text on-device using Gemini Nano via the [GenAI Summarization API](https://developers.google.com/ml-kit/genai/summarization/android).<br><br><br><br> **[> Browse code](samples/genai-summarization)**<br><br> |

[gemini-code-assist]

The alt text for this image is "Gemini Image Chat sample", which appears to be a copy-paste error. It should describe the 'On-device Writing Assistance' sample for accessibility.

Suggested change

| <img src="samples/genai-writing-assistance/nano_rewrite.png" width="150" alt="Gemini Image Chat sample"> | ✨📱🖋️ **On-device Writing Assistance**: <br>A sample letting you proofread and rewrite text using Gemini Nano via the [GenAI Rewriting API](https://developers.google.com/ml-kit/genai/rewriting/android).<br><br><br><br> **[> Browse code](samples/genai-writing-assistance)**<br><br> |

| <img src="samples/genai-writing-assistance/nano_rewrite.png" width="150" alt="On-device Writing Assistance sample"> | ✨📱🖋️ **On-device Writing Assistance**: <br>A sample letting you proofread and rewrite text using Gemini Nano via the [GenAI Rewriting API](https://developers.google.com/ml-kit/genai/rewriting/android).<br><br><br><br> **[> Browse code](samples/genai-writing-assistance)**<br><br> |

[gemini-code-assist]

There is a typo in the description for the 'Magic Selfie' sample. The word 'preson' should be 'person'.

Suggested change

| <img src="samples/magic-selfie/magic_selfie.png" width="150" alt="Magic Selfie sample"> | 🖼️📸 **Magic Selfie**: <br>A sample using [ML Kit subject Segmentation SDK](https://developers.google.com/ml-kit/vision/subject-segmentation/android) to remove the background behind a preson, and [Imagen](https://developer.android.com/ai/imagen#generate-image) to generate new background.<br><br><br><br> **[> Browse code](samples/magic-selfie)**<br><br> |

| <img src="samples/magic-selfie/magic_selfie.png" width="150" alt="Magic Selfie sample"> | 🖼️📸 **Magic Selfie**: <br>A sample using [ML Kit subject Segmentation SDK](https://developers.google.com/ml-kit/vision/subject-segmentation/android) to remove the background behind a person, and [Imagen](https://developer.android.com/ai/imagen#generate-image) to generate new background.<br><br><br><br> **[> Browse code](samples/magic-selfie)**<br><br> |