fix: add lesson 6

Les06-NextJS-QuickPoll-Part2/quickpoll-les6-starter/src/app/api/polls/[id]/route.ts

@@ -0,0 +1,27 @@
+import { NextResponse } from "next/server";
+import { getPollById } from "@/lib/data";
+import type { Poll } from "@/types";
+
+interface RouteParams {
+  params: Promise<{ id: string }>;
+}
+
+// STAP 3: GET /api/polls/[id] — enkele poll ophalen
+// (Dit bestand is COMPLEET van Les 5. Dit is stap 3 van Les 5.)
+
+export async function GET(
+  request: Request,
+  { params }: RouteParams
+): Promise<NextResponse> {
+  const { id } = await params;
+  const poll = getPollById(id);
+
+  if (!poll) {
+    return NextResponse.json(
+      { error: "Poll niet gevonden" },
+      { status: 404 }
+    );
+  }
+
+  return NextResponse.json<Poll>(poll);
+}