Add GrapheneOS

Name with link
GrapheneOS

Description
GrapheneOS is a private and secure mobile operating system with great functionality and usability. It starts from the strong baseline of the Android Open Source Project (AOSP) and takes great care to avoid increasing attack surface or hurting the strong security model. GrapheneOS makes substantial improvements to both privacy and security through many carefully designed features built to function against real adversaries. The project cares a lot about usability and app compatibility so those are taken into account for all of our features.

Link to the vector file, preferably from an official source
https://grapheneos.org/780febcc.mask-icon.svg