Create Graph_API.md

Author: rdeioris

docs/Graph_API.md

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+Add a ForEachLoop Macro node
+-
+
+```python
+import unreal_engine as ue
+from unreal_engine.classes import K2Node_MacroInstance, EdGraph
+from unreal_engine.structs import GraphReference
+
+# for_each_loop = ue.load_object(EdGraph, '/Engine/EditorBlueprintResources/StandardMacros.StandardMacros:ForEachLoop')
+for_each_loop = ue.find_object('ForEachLoop')
+
+# get a reference to your blueprint
+blueprint = ...
+
+# add the node
+node = blueprint.UberGraphPages[0].graph_add_node(K2Node_MacroInstance)
+# assign the macro graph to the node
+node.MacroGraphReference = GraphReference(MacroGraph=for_each_loop)
+# allocate pins
+node.node_allocate_default_pins()
+
+# update the blueprint
+ue.blueprint_mark_as_structurally_modified(bp)
+```