cli: do not track info

docs/operate/cli/README.md

@@ -28,3 +28,14 @@ See available subcommands under the Reference section in the navigation sidebar.
     ```shell
     nais start appname teamname --topics events
     ```
+
+## Telemetry
+
+We collect simple telemetry about usage and error messages to get a view of which features are used, and what kind of problems our users have with using the tool.
+If you don't want to share your usage you can opt out following the [Console Do Not Track (DNT)](https://consoledonottrack.com/) standard.
+
+Copy this into your terminal, or even better add it to your shell-config (for example `.zshrc` or `.bashrc`):
+
+``` shell
+export DO_NOT_TRACK=1
+```