feat: creates backend for the project

backend/src/db/pool.ts

@@ -0,0 +1,10 @@
+import { Pool } from 'pg';
+import { config } from '../config';
+
+export const pool = new Pool({
+  host: config.db.host,
+  port: config.db.port,
+  database: config.db.database,
+  user: config.db.user,
+  password: config.db.password,
+});