Update README.md

[donqu1xotevincent]

Adding Affine as an open source note taking tool.

Summary by Sourcery

Documentation:

• Add AFFiNE as an open-source note-taking tool to the README.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds AFFiNE to the list of note-taking applications in the README.md file. The addition follows the existing format of the document, including the open-source icon and relevant links.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added AFFiNE to the note-taking applications section	Added entry with open-source icon and GitHub repository link Included download link to the official website Added description highlighting it as an alternative to Notion and Miro with local-first and PKM features	README.md

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[sourcery-ai]

Hey @donqu1xotevincent - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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