feat: creates backend for the project

backend/src/config.ts

@@ -0,0 +1,21 @@
+import dotenv from 'dotenv';
+import path from 'path';
+
+dotenv.config({ path: path.resolve(__dirname, '..', '.env') });
+
+export const config = {
+  port: parseInt(process.env.PORT || '3000', 10),
+
+  db: {
+    host: process.env.DB_HOST || 'localhost',
+    port: parseInt(process.env.DB_PORT || '5432', 10),
+    database: process.env.DB_NAME || 'family_budget',
+    user: process.env.DB_USER || 'postgres',
+    password: process.env.DB_PASSWORD || 'postgres',
+  },
+
+  appUserLogin: process.env.APP_USER_LOGIN || 'admin',
+  appUserPassword: process.env.APP_USER_PASSWORD || 'changeme',
+
+  sessionTimeoutMs: parseInt(process.env.SESSION_TIMEOUT_MS || '10800000', 10),
+};