DOC: Add short list-value example

Summary

Adds a short example of list-valued properties to the documentation

Focus

Check the new tutorial section for understandability.

Test Environment

make doc and look at the resulting html.

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• All automated tests pass
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src/doc/tutorials/Data-Insertion.rst

@@ -49,11 +49,11 @@ resolution, but we'll omit this for the sake of brevity for now.
 .. code:: python
 
    rt = db.RecordType(name="2D_BarkleySimulation",
-	              description="Spatially extended Barkley simulation")
+                  description="Spatially extended Barkley simulation")
    # inherit all properties from the BarkleySimulation RecordType
    rt.add_parent(name="BarkleySimulation", inheritance="all")
    rt.insert()
-       
+
    print(rt.get_property(name="epsilon").importance) ### rt has a "epsilon" property with the same importance as "BarkleySimulation"
 
 The parameter ``inheritance=(obligatory|recommended|fix|all|none)`` of
@@ -135,15 +135,37 @@ Useful is also, that you can insert directly tabular data.
 
 .. code:: python
 
-   from caosadvancedtools.table_converter import from_tsv     
-          
-   recs = from_tsv("test.csv", "Experiment")     
-   print(recs)     
-   recs.insert()  
+   from caosadvancedtools.table_converter import from_tsv
+
+   recs = from_tsv("test.csv", "Experiment")
+   print(recs)
+   recs.insert()
 
 With this example file
 `test.csv <uploads/4f2c8756a26a3984c0af09d206d583e5/test.csv>`__.
 
+List Properties
+---------------
+
+As you may already know, properties may also have list instead of scalar
+values. They can be accessed, set, and updated as you would expect from any
+list-valued attribute in Python, as the following example illustrates.
+
+.. code:: python
+
+   import caosdb as db
+   db.Property(name="TestList", datatype=db.LIST(db.DOUBLE)).insert()
+   db.RecordType(name="TestType").add_property(name="TestList").insert()
+   db.Record(name="TestRec").add_parent("TestType").add_property(
+       name="TestList", value=[1,2,3]).insert()
+   retrieved = db.Record(name="TestRec").retrieve()
+   retrieved.get_property("TestList").value += [4,5]
+   retrieved.update()
+
+   # Check update
+   retrieved = db.Record(name="TestRec").retrieve()
+   print(retrieved.get_property("TestList").value)
+
 
 File Update
 -----------