Add initial federation example concept

docs/federation_example.md

@@ -0,0 +1,17 @@
+# Concept for a federated example
+
+### Local:
+
+- User client (Rosetta, Code, Terminal, ...)
+
+### Remote_0:
+ 
+- Fuseki instance
+
+### Remote_1:
+
+- Heterogeneous data source vault (tabular)
+
+### Remote_2:
+
+- Heterogeneous data source (other)