add imports to snippet

added imports and syntax highlighting so it is easier to run for newcomers

src/ifctester/README.md

@@ -4,7 +4,11 @@ With **IfcTester**, you can author and read **Information Delivery Specification
 
 ## How to use it
 
-```
+```python
+import ifcopenshell
+from ifctester import ids, reporter
+
+
 # create new IDS
 my_ids = ids.Ids(title="My IDS")
 
@@ -32,4 +36,4 @@ my_ids.validate(my_ifc)
 
 # show results:
 reporter.Console(my_ids).report()
-```
+```