Added python-dateutil to dependencies and created requirements.txt

docs/README.md

@@ -40,6 +40,10 @@ To run the program, you will need the following dependencies:
 `pip install requests`  
 `pip install jsonpickle`  
 `pip install canvasapi` 
+`pip install python-dateutil`
+
+You can install these dependencies using
+`pip install -r requirements.txt`
 
 Then run from the command line:  
 `python export.py`

requirements.txt

@@ -0,0 +1,4 @@
+requests
+jsonpickle
+canvasapi
+python-dateutil