Update README.md

README.md

@@ -20,6 +20,18 @@ To verify a downloaded file (e.g. `Nextcloud-Talk-v2.1.1-x86_64.AppImage`):
    - `BUILD_INFO.json`
    - `BUILD_INFO.json.asc`
 
-2. Check the file integrity:
+2. Check file integrity
    ```bash
    sha256sum Nextcloud-Talk-v2.1.1-x86_64.AppImage
+   ```
+
+3. Verify the signature
+   ```bash
+   gpg --verify BUILD_INFO.json.asc BUILD_INFO.json
+   ```
+
+   You should see 
+   ```bash
+   Good signature from "YourITtech.support <contact@yourittech.support>"
+   ```
+