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README.md

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+## Unofficial AppImage Directory
+
+## Verifying the AppImage
+
+All AppImages in this repository are built directly from the official source code and include a signed authenticity proof to confirm they are unchanged and come from a trusted build process.
+
+**EXAMPLE**
+
+To verify a downloaded file (e.g. `Nextcloud-Talk-v2.1.1-x86_64.AppImage`):
+
+1. Download the three files from the release:
+   - The AppImage itself
+   - `BUILD_INFO.json`
+   - `BUILD_INFO.json.asc`
+
+2. Check the file integrity:
+   ```bash
+   sha256sum Nextcloud-Talk-v2.1.1-x86_64.AppImage