Added gitmodules

Co-authored-by: Felix Delattre <fd@gfz-potsdam.de>

.gitmodules

+[submodule "docker-rabotnik-instance"]
+	path = docker-rabotnik-instance
+	url = ../../containers/docker-rabotnik-instance.git
+[submodule "docker-rabotnik-message-bus"]
+	path = docker-rabotnik-message-bus
+	url = ../../containers/docker-rabotnik-message-bus.git
+[submodule "docker-rcli-instance"]
+	path = docker-rcli-instance
+	url = ../../containers/docker-rcli-instance.git
+[submodule "rabotnik"]
+	path = rabotnik
+	url = ../../rabotnik.git
+[submodule "rabotnik-demo"]
+	path = rabotnik-demo
+	url = ../rabotnik-demo.git
+[submodule "rabotnik-obm"]
+	path = rabotnik-obm
+	url = ../../../openbuildingmap/rabotnik-obm.git
+[submodule "rcom"]
+	path = rcom
+	url = ../../rcom.git