Add markdown

Author: aurorarossi

GraphNeuralNetworks/docs/make_tutorials_literate.jl

@@ -5,5 +5,8 @@ ENV["DATADEPS_ALWAYS_ACCEPT"] = true
 Literate.markdown("src_tutorials/introductory_tutorials/gnn_intro.jl", 
                   "src/tutorials/"; execute = true)
 
+Literate.markdown("src_tutorials/introductory_tutorials/node_classification.jl",
+                 "src/tutorials/"; execute = true)
+
 Literate.markdown("src_tutorials/introductory_tutorials/temporal_graph_classification.jl", 
                   "src/tutorials/"; execute = true)