doc: mention bitSign code signing in main README

Signed-off-by: Richard Alpe <[email protected]>

Author: rical

README.md

@@ -135,10 +135,14 @@ for reliability you can trust:
 - **Hardware Acceleration**: Linux switchdev support for wire-speed packet processing
 - **Container Integration**: Docker support with flexible network and hardware access
 - **Memory Efficient**: Runs comfortably on devices with as little as 256 MB RAM
+- **Code Signing**: All releases are cryptographically signed for integrity verification
 
 Perfect for everything from resource-constrained edge devices to
 high-throughput network appliances.
 
+[![Code signing powered by bitSign](https://bitsign.se/assets/badges/powered-by-bitsign-light.png#gh-light-mode-only)](https://bitsign.se)
+[![Code signing powered by bitSign](https://bitsign.se/assets/badges/powered-by-bitsign-dark.png#gh-dark-mode-only)](https://bitsign.se)
+
 > Check the *[Latest Build][]* for bleeding-edge features.
 
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