start adding dummy nodes

agent/nodes/dummyNormalisationModel.ts

@@ -0,0 +1,11 @@
+import { GraphNode } from "@langchain/langgraph";
+import { MessagesState } from "../state";
+import { AIMessage, HumanMessage } from "@langchain/core/messages";
+
+export const dummyNormalisationModel: GraphNode<typeof MessagesState> = async (state) => {
+  //TODO: call AI model with collected data
+
+  return {
+    messages: [ new AIMessage(state.messages.at(-1)?.content + " Processed")]
+  };
+};