📝 Add README

README.md

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+# ItslearningDL.go
+
+This Application downloads all file resources that a student has access to from the [Itslearning](https://itslearning.com/global/) learning platform, and stores them on the local disk, retaining the original file structure.
+
+## Setup
+
+To build this project into an executable binary, make sure you have Golang installed and run
+
+```
+go build
+```
+
+Then create a `.env` file in the same directory as the binary and set your itslearning credentials
+
+```
+# Your itslearning username
+ITSLEARNING_USERNAME=
+# Your itslearning password
+ITSLEARNING_PASSWORD=
+# The itslearning instance to use
+# ex. https://berlin.itslearning.com
+ITSLEARNING_INSTANCE=
+```
+
+And run the applcation by executing the binary
+
+```
+./itslearningdl
+```
+
+If everything was successful, the program will now create an `out` folder and save all downloaded files into it.