You first need to import the mbed-os library to start coding! To do so:
1. Click on "Import"
2. In the upper part of the new view click on: "Click here" to import from url
3. Compile like this: "Source URL": https://github.com/ARMmbed/mbed-os/, "Import as": Library, "Import name": mbed-os, 
                      "Target Path": Exercise_workshop (or the name of your project)
4. 