added info about logging to client/README

client/README.md

@@ -13,3 +13,17 @@ To see a topology, `../app/app` needs to be running, as well as a probe.
 This directory has a `.eslintrc`, make sure your editor supports linter hints.
 To run a linter, you also run `gulp lint`.
 
+## Logging
+
+The Scope UI uses [debug](https://www.npmjs.com/package/debug) for logging, e.g.,:
+
+```
+const debug = require('debug')('scope:app-store');
+debug('Store log message');
+```
+
+To enable logging in the console, activate it via `localStorage` in the dev tools console:
+
+```
+localStorage["debug"] = "scope:*"
+```