Add Structure Systems to Friends

Fixes #839

Author: steveklabnik

_data/users.yml

@@ -402,3 +402,8 @@
   url: https://www.tcell.io
   logo: tcell.png
   how: "<a href='https://www.tcell.io/2017/06/agents-rust/'>tCell's agent is built using Rust</a> and runs in the app server as a means to collect data and block attacks."
+-
+  name: Structure Systems
+  url: https://www.structure.systems
+  logo: structuresystems.svg
+  how: "We develop software in Rust that helps organizations comply with information privacy/data protection rules."