docs: add Weblate link for translators to README

[Aqil-Ahmad]

Fixes #1493

Changes

Updated README.md. Added a dedicated Translations section with Weblate link for contributors

Checklist:

• No hard coding: I have used resources from constants.dart without hard coding any value.
• No end of file edits: No modifications done at end of resource files.
• Code reformatting: I have reformatted code and fixed indentation in every file included in this pull request.
• Code analyzation: My code passes analyzations run in flutter analyze and tests run in flutter test.

Summary by Sourcery

Documentation:

• Add Translations section to README linking to the project's Weblate translation platform

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR enriches the project documentation by introducing a dedicated Translations section in the README, providing contributors with a direct link to the Weblate platform for managing language translations.

File-Level Changes

Change	Details	Files
Added a new Translations section in the README	Introduced '## Translations' heading Added guidance for translators to support the project Included the Weblate project URL	README.md

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#1493	Add information to the README for translators about how to support the project in Weblate, including the relevant link.	✅

Possibly linked issues

• Add info for translators to Readme #1493: The PR adds the Weblate link for translators to the README, fulfilling the issue's request to add this information.

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[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• Consider adding a link to the new Translations section in the README’s table of contents so it’s discoverable without scrolling.
• For consistency, wrap the Weblate URL in markdown link syntax (e.g., [Weblate project page](https://hosted.weblate.org/projects/fossasia/badge-magic-app/)).

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider adding a link to the new Translations section in the README’s table of contents so it’s discoverable without scrolling.
- For consistency, wrap the Weblate URL in markdown link syntax (e.g., `[Weblate project page](https://hosted.weblate.org/projects/fossasia/badge-magic-app/)`).

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