Implement message schema

prisma/schema.prisma

@@ -6,6 +6,16 @@ generator client {
 }
 
 datasource db {
-  provider = "postgresql"
+  provider = "sqlite"
   url      = env("DATABASE_URL")
 }
+
+model Message{
+  id Int @id @default(autoincrement())
+  author String
+  gameId String
+  title String
+  content String
+  sentAt DateTime @default(now())
+  updatedAt DateTime? @updatedAt
+}
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