doc: add InputFile upload example

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Summary by CodeRabbit

• Documentation
  • Added file upload guide with code example demonstrating how to pick and upload files to a bucket
  • Enhanced error handling documentation with practical code examples

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Walkthrough

This pull request updates the README.md documentation with two Flutter-Dart code examples. The first addition demonstrates file uploading functionality, showing how to pick a file using FilePicker, construct an InputFile from bytes and filename, and upload it to a bucket via Storage.createFile. The second addition provides a concrete error handling example using Dart's try/catch to catch AppwriteException. Both sections include necessary configuration notes such as placeholder bucket ID replacement.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

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Reviewing files that changed from the base of the PR and between c2b5cf8 and 1cf5024.

📒 Files selected for processing (1)

• README.md

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