Set up Google OAuth with next-auth and prepared for user table creation

pages/api/auth/[...nextauth].js

@@ -0,0 +1,17 @@
+import NextAuth from 'next-auth';
+import GoogleProvider from 'next-auth/providers/google';
+
+export default NextAuth({
+  providers: [
+    GoogleProvider({
+      clientId: process.env.GOOGLE_CLIENT_ID,
+      clientSecret: process.env.GOOGLE_CLIENT_SECRET,
+    }),
+  ],
+  callbacks: {
+    async session({ session, token }) {
+      session.user.id = token.sub;
+      return session;
+    },
+  },
+});