some more markdown enhancements

docs/index.rst

@@ -8,7 +8,6 @@ Welcome to co2calculator's documentation!
 
 **co2calculator** is a Python package to calculate work related CO2 emissions from heating and electricity consumption as well as business trips and commuting.
 
-
 Contents
 ==================
 
@@ -19,6 +18,7 @@ Contents
    :includehidden:
 
    documentation
+   tutorial
    businesstrips
    commuting
    calculate/heating_electricity

docs/tutorial.md

@@ -0,0 +1,17 @@
+# Tutorial
+
+The co2calculator package is available via pip: 
+
+```python
+pip install co2calculator
+```
+
+For a simple and basic emission calculation, import the calculation function and define some emission cause: 
+
+```python
+
+from co2calculator import calculate_trip
+from co2calculator.enums import TransportationMode
+
+co2e = calculate_trip(distance=200,transportation_mode=TransportationMode.CAR)
+```