feat: add database connection config

Author: Victor

src/config/database.js

@@ -0,0 +1,9 @@
+import { Pool } from 'pg';
+
+const databaseConfig = new Pool({
+    host: process.env.DB_HOST,
+    port: process.env.DB_PORT,
+    user: process.env.DB_USERNAME,
+    password: process.env.DB_PASSWORD,
+    database: process.env.DB_DATABASE
+});