updated readme

README.md

@@ -26,10 +26,22 @@ Code snapshots (which you find in `/code`) are there for you to compare your cod
 
 You can either view my code directly here on Github (you can open + view code files without issues here) or you download the snapshots.
 
+The subfolders in the `/code` folder are named such that mapping them to the course lectures is straightforward.
+
 ### Downloading code snapshots
 
 You can download all the content of a branch via the "Code" button here on Github. You can then either [clone](https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/cloning-a-repository) the repository or simply download the selected branch content as a ZIP file.
 
 **Important:** You always download the **entire branch content!**
 
-You can then dive into the interesting folders (e.g. the individual code snapshots) locally on your hard drive.
+You can then dive into the interesting folders (e.g. the individual code snapshots) locally on your hard drive.
+
+### Running the attached code
+
+You can use the attached code simply to compare it to yours. But you can also run it.
+
+To run my code, navigate into a specific code snapshot folder via the `cd` command in your command prompt or terminal first.
+
+Then run `npm install` to install all required dependencies (this will create a `/node_modules` folder).
+
+**Important:** If you're using the code for a module that requires API keys or a backend (e.g. the module about sending Http requests), you'll have to use **your backend URLs** or API keys. Mine won't work (I disabled my projects).