add leaderboard

db.js

@@ -0,0 +1,19 @@
+import sqlite3 from 'sqlite3'
+import { open } from 'sqlite'
+
+let db;
+
+async function initDb() {
+    if (db) return db;
+
+    db = await open({
+        filename: `${process.cwd()}/db/main.db`,
+        driver: sqlite3.Database
+    });
+
+    await db.run(`CREATE TABLE IF NOT EXISTS stats (username TEXT, ip TEXT, ko TEXT);`);
+
+    return db;
+}
+
+export default initDb;