Add example

examples/implicit-nodes.ts

@@ -0,0 +1,22 @@
+#!/usr/bin/env -S npx ts-node --transpileOnly
+
+import { Substrate, GenerateText } from "substrate";
+
+async function main() {
+  const SUBSTRATE_API_KEY = process.env["SUBSTRATE_API_KEY"];
+
+  const substrate = new Substrate({ apiKey: SUBSTRATE_API_KEY });
+
+  const a = new GenerateText(
+    { prompt: "tell me about windmills" },
+    { id: "a" },
+  );
+  const b = new GenerateText({ prompt: a.future.text }, { id: "b" });
+  const c = new GenerateText({ prompt: b.future.text }, { id: "c" });
+
+  // Because the `c` is the the final node in the graph we can find nodes it depends
+  // on through the relationships created via the input arguments.
+  const res = await substrate.run(c);
+  console.log(res.json);
+}
+main();