add prisma

lib/prisma.ts

@@ -0,0 +1,14 @@
+import { PrismaClient } from '@prisma/client';
+
+let prisma: PrismaClient;
+
+if (process.env.NODE_ENV === 'production') {
+  prisma = new PrismaClient();
+} else {
+  if (!global.prisma) {
+    global.prisma = new PrismaClient();
+  }
+  prisma = global.prisma;
+}
+
+export default prisma;