Example usage (#65)

## What is the goal of this PR?

We add a link to an example that uses TypeDB Loader.

## What are the changes implemented in this PR?

Replace the duplicated line with a link to a non-exisitng tutorial with a line linking to an example in the typedb-examples repo.

README.md

@@ -115,7 +115,7 @@ public class LoadingData {
 
 A complete tutorial for TypeDB version >= 2.5.0 is in work and will be published asap.
 
-A complete tutorial for TypeDB version >= 2.5.0 is in work and will soon be [on Medium]()
+An example of configuration and usage of TypeDB Loader on real data can be found [in the TypeDB Examples](https://github.com/vaticle/typedb-examples/tree/master/biology/catalogue_of_life).
 
 A complete tutorial for TypeDB (Grakn) version < 2.0 can be found [on Medium](https://medium.com/@hkuich/introducing-grami-a-data-migration-tool-for-grakn-d4051582f867).