Added basic user roles

prisma/schema.prisma

@@ -8,11 +8,17 @@ datasource db {
   relationMode = "prisma"
 }
 
+enum UserRole {
+  USER
+  ADMIN
+}
+
 model User {
   id String @id @default(cuid())
   name String?
   email String? @unique
   emailVerified DateTime?
+  role UserRole @default(USER)
   image String?
   ttsDefaultVoice Int @default(1)
   ttsEnabledVoice Int @default(1048575)