Update Redme icon info and Example

Author: jonassorgenfrei

README.md

@@ -7,13 +7,26 @@ QT Editor for the flowpipe framework based on NodeGraphQt.
 
 NOTE: In it's current state the Widget is a visualizer only not an editor.
 
+For interpreter based node icons the <i>interpreter</i> key in the node's metadata (if existing) is used to find the matching icon from: 
+`flowpipe_editor.flowpipe_editor_widget.ICONS_PATH`.
+
 ## Example
 ```python
-from flowpipe import Graph
+from flowpipe import Graph, Node
 from flowpipe_editor.flowpipe_editor_widget import FlowpipeEditorWidget
 
+@Node(outputs=["renderings"], metadata={"interpreter": "houdini"})
+def HoudiniRender(frames, scene_file):
+    """Creates a Houdini scene file for rendering."""
+    return {"renderings": "/renderings/file.%04d.exr"}
+
 graph = Graph(name="Rendering")
 
+houdini_render = HoudiniRender(
+    name="HoudiniRender{0}-{1}".format(i, i + batch_size),
+    graph=graph,
+    frames=range(i, i + batch_size),
+)
 # ... create nodes and append to graph ...
 
 window = QtWidgets.QWidget()