Add directive to document interactio_graph module

doc/source/command_line_doc.rst

@@ -47,3 +47,8 @@ Search Minimal Accessibility Conditions
 .. automodule:: cadbiom_cmd.solution_search
    :members:
 
+Make an interaction graph based on molecules of interest
+========================================================
+
+.. automodule:: cadbiom_cmd.interaction_graph
+   :members:
\ No newline at end of file