Add small readme instruction

README.md

-# scratch-gui
+# logging-scratch-gui
+Modified version of the scratch-gui that captures user actions using scratch-log-sender, and sends them to scratch-log-endpoint.
+
+## Installation
+To use logging-scratch-gui, simply change the following line inside src/containers/gui.jsx to the URL of your scratch-log-endpoint:
+```bash
+const wsUrl = 'wss://endpoint.example.com/logging'; // Add your endpoint url here
+```
+
+Then simply launch the gui using npm, as described in the original readme.
+
+<br/>
+<br/>
+
+
+# Original readme of scratch-gui
+
 #### Scratch GUI is a set of React components that comprise the interface for creating and running Scratch 3.0 projects
 
 ## Installation