Enhance project setup with Prisma, new scripts, and dependencies; update README for clarity and add API routes; improve layout and styling for better user experience

src/lib/db.ts

@@ -0,0 +1,7 @@
+import { PrismaClient } from "@prisma/client";
+
+const globalForPrisma = globalThis as unknown as { prisma: PrismaClient };
+
+export const prisma = globalForPrisma.prisma ?? new PrismaClient();
+
+if (process.env.NODE_ENV !== "production") globalForPrisma.prisma = prisma;