Add elements/triples to an existing graph

#### Description:

While working together with other people, sometimes we might want to add objects on an existing graph. We need to be able to add objects/nodes/triples to existing *.ttl files. It can be either just updating some existing elements, (reading the exported graph -converting it to BHoM) adding some attributes and updating the object on the graph.

In this way we prove that we can use the "live data graph" during the design phase.
I already illustrated the design loop, which includes data validations:

We can discuss it in the upcoming Tuesday.