experimental: add docker-compose for setting up environment

experimental/compose/docker-compose.yml

+version: '3'
+services:
+        luoweb:
+                image: "schaertl/luoweb"
+                ports:
+                        - 7300:7300
+
+        graphdb:
+                # We use an unoffcial image as there is no official
+                # image for the free version. It is possible to build
+                # your own free container but for quick development I
+                # prefer this solution as it means no special downloads.
+                image: "daschswiss/graphdb:9.0.0-free"
+                ports:
+                        - 7200:7200