Merge pull request #401 from jjnicola/readme7

Add hint for the release file signatures key to README (openvas-7.0)

Author: bjoernricks

README.md

@@ -13,6 +13,13 @@ It is used for the Greenbone Security Manager appliances and is a full-featured
 scan engine that executes a continuously updated and extended feed of Network
 Vulnerability Tests (NVTs).
 
+## Releases
+
+All [release files](https://github.com/greenbone/openvas/releases) are signed with
+the [Greenbone Community Feed integrity key](https://community.greenbone.net/t/gcf-managing-the-digital-signatures/101).
+This gpg key can be downloaded at https://www.greenbone.net/GBCommunitySigningKey.asc
+and the fingerprint is `8AE4 BE42 9B60 A59B 311C  2E73 9823 FAA6 0ED1 E580`.
+
 ## Installation
 
 This module can be configured, built and installed with following commands: