Moving the copilot-sdk cookbook content in here

cookbook/copilot-sdk/nodejs/recipe/multiple-sessions.ts

@@ -0,0 +1,33 @@
+import { CopilotClient } from "@github/copilot-sdk";
+
+const client = new CopilotClient();
+await client.start();
+
+// Create multiple independent sessions
+const session1 = await client.createSession({ model: "gpt-5" });
+const session2 = await client.createSession({ model: "gpt-5" });
+const session3 = await client.createSession({ model: "claude-sonnet-4.5" });
+
+console.log("Created 3 independent sessions");
+
+// Each session maintains its own conversation history
+await session1.sendAndWait({ prompt: "You are helping with a Python project" });
+await session2.sendAndWait({ prompt: "You are helping with a TypeScript project" });
+await session3.sendAndWait({ prompt: "You are helping with a Go project" });
+
+console.log("Sent initial context to all sessions");
+
+// Follow-up messages stay in their respective contexts
+await session1.sendAndWait({ prompt: "How do I create a virtual environment?" });
+await session2.sendAndWait({ prompt: "How do I set up tsconfig?" });
+await session3.sendAndWait({ prompt: "How do I initialize a module?" });
+
+console.log("Sent follow-up questions to each session");
+
+// Clean up all sessions
+await session1.destroy();
+await session2.destroy();
+await session3.destroy();
+await client.stop();
+
+console.log("All sessions destroyed successfully");